QUIPS

DTI in 2020!

4 Dec 19

DTI 2020 Training Schedule

Our 2020 Training Schedule (below) has been updated and is currently posted on the DTI Web Page.

Discounts apply!

You can register directly on our DTI Web Page at defense-training.com

We continue to advance the Art!

8-9 Feb 20 DTI Defensive Handgun, Camden, TN
15-16 Feb 20 DTI Vehicle Defense, Homestead, FL
22-23 Feb 20 DTI Urban Rifle, Jackson, MS
29 Feb-1 Mar 20 DTI Urban Rifle, Victoria, TX
29 Feb-1 Mar 20 DTI Defensive Handgun, Victoria, TX

14-15 Mar 20 DTI, Advanced Defensive Handgun, Tipp City, OH
21-22 Mar 20 DTI Up Close and Personal Defense II, Naples, FL (on-line registration not available for this DTI Course. Contact our local Course Coordinator, Dave Alter, directly at dalter@caffllc.com)

4-5 Apr 20 DTI Urban Rifle, Slidell, LA
10-12 Apr (Fri-Sun) DTI Off-Body Carry Instructor Course, Nunn, CO
11-12 Apr 20 DTI Defensive Handgun, Sussex, NJ
25-26 Apr 20 DTI Armed Response to a Terrorist Attack, Columbia, MO

2-3 May 20 DTI Urban Rifle, Aspen, CO
8-9 May 20 (Fri-Sat) DTI ARTA (Armed Response to a Terrorist Attack), Lehi, UT
23-24 May 20 DTI UCAP (Up Close and Personal Defense), Los Angeles, CA
30-31 May 20 DTI Urban Rifle, Nunn, CO

5-7 June 20 Women’s Defensive Handgun, Advanced, Elk Mountain, WY. (On-line registration for this DTI Course is not available. Contact our local Course Coordinator, Susan, at office@elkmountainhotel.com)
6-7 June 20 DTI Defensive Handgun, Coraopolis, PA
8 June 20 (Mon) DTI Tactical treatment of Gunshot Wounds, Coraopolis, PA
13-14 June 20 DTI Teaching Women to Shoot, Tipp City, OH

11-12 July 20 DTI Defensive Handgun, Firth, NE
18-19 July 20 DTI Urban Rifle, Warrendale, PA
25-26 July 20 DTI Low-Light Shooting, Handgun and Rifle, Morristown, MN

8-9 Aug 20 DTI Vehicle Defense, Sturgis, MI
8-9 Aug 20 DTI Women’s Defensive Handgun, Sturgis, MI
15-16 Aug 20 DTI Defensive Handgun, Kalispell, MT
21-23 Aug 20 DTI Women’s Defensive Handgun, Fundamentals, Elk Mountain, WY (On-line registration for this DTI Course is not available. Contact our local Course Coordinator, Susan, at office@elkmountainhotel.com)
22-23 Aug 20 DTI ARTA (Armed Response to a Terrorist Attack) Plymouth, OH
29-30 Aug 20 DTI Instructor’s Course, Manchester, NH

11-13 Sept 20 (Fri-Sun) DTI Off-Body Carry Instructor Course, Nunn, CO
11-12 Sept 20 (Fri-Sat) DTI Urban Rifle, Lehi, UT
19-20 Sept 20 DTI Urban Rifle, Kankakee, IL
26-27 Sept 20 DTI Urban Rifle, Victoria, TX
26-27 Sept 20 DTI Defensive Handgun, Victoria, TX

3-4 Oct 20 DTI Urban Rifle, Sussex, NJ
10-11 Oct 20 DTI Urban Rifle, South Lake Tahoe, NV
17-18 Oct 20 DTI Women’s Defensive Handgun, Nashville, TN

7-8 Nov 20 DTI Urban Rifle, Columbia, SC
7-8 Nov 20 DTI Women’s Defensive Handgun, Columbia, SC

Imagine!

2 Dec 19

Narwhal Tusk!

Not surprisingly, the British media is making much today of the famous “Narwhal Tusk” that played a role in Friday’s Islamic terrorist attack on London Bridge.

They are making it all into a new “London Bridge Legend!”

And yet, imagine for a moment that history were different, and the words “Narwhal Tusk” in news reports were replaced with “Browning HP35 9mm Pistol.”

Imagine that this knife-wielding Islamic terrorist on London Bridge had this time been incisively stopped-cold by several 9mm bullets, precisely launched by a righteous British subject who was there and carrying a concealed Browning High Power!

Imagine, because this righteous British subject was there, armed, alert, skilled, and decisive, that this terrorist attack had been quickly terminated, with awesome finality, before innocents could be harmed!

Imagine that the current British government actually trusted its loyal subjects, in such grievous circumstances, to take decisive, individual, unilateral action, upon their own summary command and judgment, instead of waiting helplessly for police to arrive, as innocent people are wantonly murdered!

Would the starry-eyed press, there and here, now be posting fawning, sycophantic tributes to John Browning’s famous pistol, that saw decades of faithful service in Her Majesty’s Armed Forces?

Of course not!

The smug, liberal media would either:

1. Impose a black-out on the story, refusing to report it, because of the silent “rule” in the leftist media that guns, particularly privately-owned guns, are never to be portrayed in a positive manner.

2. Point out where this righteous subject/citizen could have done it better, so that their precious Islamic terrorist, whom they fawn-over endlessly, would not have been hurt.

3. Demand that innocent gun-owning citizens/subjects be thrown into prison, as violent criminals are let out!

Why else do we see ever-recurring, hysterical, tear-jerking governmental apologies automatically issued whenever British “Specialist Firearms Officers” righteously shoot a violent criminal?

“The tone and tendency of liberalism is to attack institutions of the country (specifically Judeo/Christian values) under the name of ‘reform’ and to make war on manners and customs of the people, under the pretext of ‘progress.’”

Benjamin Disraeli

/John

London Bridge, Again!

30 Nov 19

“In modern political science, there is no universally-accepted definition of the term, ‘government,’ nor has there ever been one!”

Werner

London Bridge, Again!

On 3 June 2017, Islamic terrorists first ran down hapless pedestrians in a busy part of London (London Bridge). Then, armed with knives, they exited their van, slashing, stabbing, and kicking the injured who were trying to limp and crawl away! Terrorists subsequently entered adjacent restaurants and attacked anyone they could.

Seven innocent British citizens wantonly murdered that day, seven times that number injured.

Three Islamic terrorists where ultimately shot to death by police. They were wearing explosive “suicide belts,” which were eventually determined to be fake.

The foregoing occurred two and a half years ago.

Yesterday, in the exact same place, a single Islamic terrorist (recently convicted of terrorist activity, but released early from prison, and wearing an ankle bracelet) precipitously attacked, with knives, hapless attendees of a Cambridge-University-sponsored prisoner rehabilitation conference, entitled “Learning Together,” at the north end of London Bridge.

You can’t make this stuff up!

To their credit, armed police showed-up within a few minutes, and quickly took care of business!

Terrorist was DRT.

Like terrorists in the 2017 incident, he was wearing what was designed to look like an explosive vest.
It turned out to be fake, but no one else knew that at the time!

Sadly, in the interim two innocent British citizens were murdered, several more critically injured.

Several audacious bystanders, also to their credit, corralled the suspect prior to the arrival of police.

One bystander commandeered a nearby narwhal tusk to aid him in the task!

My comments:

1. In 2019, a good and decent, law-abiding British subject of Her Majesty, with no criminal record of any kind, cannot acquire a license to even possess, much less carry, any species of firearm.

In fact, British subjects cannot even own so much as a Swiss Army Knife!

And yet, a convicted Islamic terrorist, duly investigated, arrested, tried, and found guilty in a court of law of multiple terrorist-related offenses can acquire a “licence” (British spelling) to walk right out of one of Her Majesty’s prisons, and then, to the surprise of no one, re-offend with scant delay!

2. This terrorist was wearing an ankle-bracelet-monitor when he committed murder on London Bridge, and was likely simultaneously within the view of several CCTV cameras.

Neither the bracelet, nor the cameras, made any of the victims one bit safer!

3. Will liberal politicians now reconsider easing UK’s gun laws and other laws that essentially make any act of self-defense by a British subject a crime?

Not a chance!

What they doubtless will do is immediately place new restrictions on narwhal tusks!

Simultaneously, but oh-so quietly, these nauseating hypocrites will apprehensively bolster their own heavily-armed bodyguard staffs!

4. This morning, I patiently listened to a gaggle of “expert” commentators talk about personal security, here and there. They droned-on ad-nauseam about running and hiding and never taking any definitive action, the usual liberal drivel!

The “elephant in the room” is that virtually all of Western Europe, Australia, the UK, and New Zealand categorically prohibit the carrying of defensive firearms by subjects/citizens.

Not the slightest mention of the many cases where armed American citizens have taken-down terrorists, and assorted other violent criminals.

These pathetic frauds refuse to even entertain the subject!

5. Who have grown weary of listening to these leftist clowns, know and understand that, in our current “Age of Terrorism,” the sage go armed!

The sage are well trained, well armed, and we are not content to be “good little victims,” as liberals insist.

“The first right of every human being is the right of self-defense. Without that right, all others are meaningless.

The right of self-defense is not something government ‘bestows’ upon citizens. It is a preexisting, inalienable, individual right, older than the Constitution itself.

It existed prior to all governments, and prior to the social contract of our Constitution.”

Larry Craig

/John

London Bridge, Again!

30 Nov 19

“In modern political science, there is no universally-accepted definition of the term, ‘government,’ nor has there ever been one!”

Werner

London Bridge, Again!

On 3 June 2017, Islamic terrorists first ran down hapless pedestrians in a busy part of London (London Bridge). Then, armed with knives, they exited their van, slashing, stabbing, and kicking the injured who were trying to limp and crawl away! Terrorists subsequently entered adjacent restaurants and attacked anyone they could.

Seven innocent British citizens wantonly murdered that day, seven times that number injured.

Three Islamic terrorists where ultimately shot to death by police. They were wearing explosive “suicide belts,” which were eventually determined to be fake.

The foregoing occurred two and a half years ago.

Yesterday, in the exact same place, a single Islamic terrorist (recently convicted of terrorist activity, but released early from prison, and wearing an ankle bracelet) precipitously attacked, with knives, hapless attendees of a Cambridge-University-sponsored prisoner rehabilitation conference, entitled “Learning Together,” at the north end of London Bridge.

You can’t make this stuff up!

To their credit, armed police showed-up within a few minutes, and quickly took care of business!

Terrorist was DRT.

Like terrorists in the 2017 incident, he was wearing what was designed to look like an explosive vest.
It turned out to be fake, but no one else knew that at the time!

Sadly, in the interim two innocent British citizens were murdered, several more critically injured.

Several audacious bystanders, also to their credit, corralled the suspect prior to the arrival of police.

One bystander commandeered a nearby narwhal tusk to aid him in the task!

My comments:

1. In 2019, a good and decent, law-abiding British subject of Her Majesty, with no criminal record of any kind, cannot acquire a license to even possess, much less carry, any species of firearm.

In fact, British subjects cannot even own so much as a Swiss Army Knife!

And yet, a convicted Islamic terrorist, duly investigated, arrested, tried, and found guilty in a court of law of multiple terrorist-related offenses can acquire a “licence” (British spelling) to walk right out of one of Her Majesty’s prisons, and then, to the surprise of no one, re-offend with scant delay!

2. This terrorist was wearing an ankle-bracelet-monitor when he committed murder on London Bridge, and was likely simultaneously within the view of several CCTV cameras.

Neither the bracelet, nor the cameras, made any of the victims one bit safer!

3. Will liberal politicians now reconsider easing UK’s gun laws and other laws that essentially make any act of self-defense by a British subject a crime?

Not a chance!

What they doubtless will do is immediately place new restrictions on narwhal tusks!

Simultaneously, but oh-so quietly, these nauseating hypocrites will apprehensively bolster their own heavily-armed bodyguard staffs!

4. This morning, I patiently listened to a gaggle of “expert” commentators talk about personal security, here and there. They droned-on ad-nauseam about running and hiding and never taking any definitive action, the usual liberal drivel!

The “elephant in the room” is that virtually all of Western Europe, Australia, the UK, and New Zealand categorically prohibit the carrying of defensive firearms by subjects/citizens.

Not the slightest mention of the many cases where armed American citizens have taken-down terrorists, and assorted other violent criminals.

These pathetic frauds refuse to even entertain the subject!

5. Who have grown weary of listening to these leftist clowns, know and understand that, in our current “Age of Terrorism,” the sage go armed!

The sage are well trained, well armed, and we are not content to be “good little victims,” as liberals insist.

“The first right of every human being is the right of self-defense. Without that right, all others are meaningless.

The right of self-defense is not something government ‘bestows’ upon citizens. It is a preexisting, inalienable, individual right, older than the Constitution itself.

It existed prior to all governments, and prior to the social contract of our Constitution.”

Larry Craig

/John

Bullpups!

29 Nov 19

Bullpups:

The “bullpup” design for military rifles places the action and magazine behind the trigger.

The term was first used to describe embellished target pistols, so I’m not sure how, nor when, it first came to describe this particular design for rifles.

The first example of the “bullpup” rifle pattern was the obscure British bolt-action Thorneycroft Rifle, and the similar Godsal Rifle (also British), both dating from the early 1900s. Both represented attempts to make a short military rifle, owing to the unhappy British experience with long, clumsy rifles during the Second Anglo-Boer War in South Africa.

Neither were adopted, nor ever referred to by the term, ‘bullpup.”

In 1951, the British briefly adopted the optical-sighted EM2 (Janson Rifle), which was an innovative bullpup autoloader in 280 British caliber. However, it was quickly swept-aside by the FAL in 7.62×51, at the insistence of the Churchill Administration, bowing to pressure from the USA, and the balance of NATO, to standardize on 7.62×51 caliber (308).

The term, “bullpup” was used to describe the EM2.

Modern “bullpup” military rifles, originally attractive because of their compactness (they were imagined to combine the role of rifle and SMG into a single weapon), saw popularity during the 1970s and 1980s, but have since fallen out of fashion, owing to lack of ambidexterity, poor triggers, and difficulty in reducing stoppages and performing chamber-checks.

The four current best-known military bullpup rifles are the British SA80, The Steyr AUG, the French FAMAS, and the Israeli TAVOR.

The more recent, American-made, Desert Tech MDR fits the same description, as does the Kel-Tec RFB

The Chinese bullpup QBZ95, adopted by the Chinese military in 2006, replaced their “Type-81” (Kalashnikov)

The AUG, FAMAS, and TAVOR can be converted from right-hand, to left-hand ejection, but not readily, and certainly not under active, field conditions.

The SA80 cannot be converted at all and thus cannot be shot off the left shoulder without the reciprocating bolt handle striking the shooter in the mouth.

Charging handles on the AUG and TAVOR are non-reciprocating.

On the FAMAS, the charging handle is reciprocating, but it it on top and does not impact the shooter’s face, no matter on which side he has the rifle mounted.

Because of the long distance between trigger and sear, triggers on most bullpup rifles are poor, as noted above.

The AUG was imported into the USA and had been subsequently manufactured domestically, so they are fairly common.

The TAVOR has been actively imported and marketed by IMI in the USA, so they are also common.

The FAMAS was imported briefly in the 1970s, but fewer than 200 ever reached our shores. They are very rare over here today. They can be found in France, but the civilian version is chambered for 222 Rem, as France (like Mexico) has a ban on military calibers in civilian hands

Desert Tech and Kel-Tec are both American companies and market their rifles to domestic, civilian consumers, but neither has secured military contracts for their wares

The SA80 has never been imported into the USA, and until recently its reputation in the field has been very poor. Current production quality is much better, as the entire rifle was refurbished under contract with H&K, but the rifle is still virtually unknown outside the UK.

The QBZ95 (chambered for the Chinese 5.8×42 cartridge) has never been seen outside the PRC (China).

In our DTI Urban Rifle Courses, we see an occasional TAVOR and AUG. Both are popular with the small-statured, as most of the rifle’s weight is to the rear.

What the majority of our students bring, however, are ARs, XCRs, POFs, VSKAs (Kalashnikovs), M1As, FALs, PTRs, M1 Carbines, SCARs, ARXs.

We’ve had one Kel-Tec RFB show up. We’ve yet to see a Desert Tech MDR.

/John

Serialization!

26 Nov 19

Serialization:

Serialization of various parts of military rifles and pistols was necessitated in a bygone era of manufacturing, where much hand-fitting was necessary at the end of the production process, and parts were thus not
interchangeable between individual guns.

Accordingly, consumers understandably wanted a way to keep together all parts assembled at the factory into one gun.

In those days, guns were “roughed-out” by machine, then “finished” by hand. Individual parts were carefully adjusted and modified, as appropriate, so that they worked perfectly together.

Thus, “matching serial numbers” were valued, indeed highly prized.

Today, “hand-fitting” is confined to expensive sporting and “collector” guns.

With current production military guns, and other guns designed for serious purposes, matching serial numbers, at least with regard to functionality, are irrelevant.

With modern serious guns, matching serial numbers attain relevance only within the arbitrary discipline of “collector value”

Until 1968, it was not legally required that rifles manufactured in the USA be serialized at all, although by then most were!

Even so, serialization was required only of receivers.

With modern manufacturing methods, and parts that are completely interchangeable between individual product copies, serialization of any part is no longer necessary for the sake of quality control, as noted above, although it is still a legal requirement for receivers.

Most manufacturers continue to serialize other parts as well, mostly due to tradition and bureaucratic momentum.

Many Glocks we see in our Courses are “parts guns.” So long as all parts are “OEM” (Original Equipment Manufacturer), those guns are every bit as functional as new, out-of-the-box pistols.

With ARs, it is pretty much the same!

/John

Arms Race!

21 Nov 19

Arms Race, in Europe and the USA:

Breech-loading carbines (short rifles) became popular with cavalry units during the American Civil War, because reloading a muzzle-loading rifle (or carbine) while seated on a horse was difficult, to say the least!

So, Infantry units stuck for the moment with muzzle-loading rifles, while cavalry units started looking at breech-loading carbines such as the Spencer, Henry, Sharps, Lamson&Ball (after American gunsmith, Albert Ball and his financier, EG Lamson), Dreyse (needle-fire, named for German gunsmith Johann Nikolaus von Dreyse), Burnside, et al, tubular magazines, and eventually self-contained, metallic cartridges!

Breech-loading rifles and carbines using paper cartridges (Dreyse, Chassepot) came with what looks like a ram-rod, or cleaning-rod, usually within a tube in the forend. Actually, it is a “clearing-rod.”

The actual “needle” was long and thin and had to pierce the back of the paper cartridge, go all the way through the gunpowder, and then strike the primer, which was a the base of the bullet. Needles thus broke frequently, and even when they didn’t, burned-out within one hundred rounds or so. Accordingly, needles were easily replaced without disassembling the rifle, and every soldier was issued several.

When a paper cartridge fails to fire, there is no rim, nor extraction-ring which could be used to pull it out from the rear. Before the rifle can be reloaded and put back to use, the unfired cartridge needs to be removed, and the only way is to push it rearward and out of the barrel from the muzzle end, using a clearing-rod with a probe nearly the diameter of the barrel. You wouldn’t want a pointed end, lest it pierce the lead bullet and then the recalcitrant primer and thus cause the weapon to fire, while the clearing-rod is in the barrel!

The forgoing procedure was also necessary when you merely wanted to safely unload the rifle, without firing it.

By contrast, the only way to “unload” a muzzle-loader was to fire it!

It was Dreyse-equipped Prussian soldiers who annihilated muzzle-loader-equipped Danish during the Second Schleswig War of 1864 (Schleswig was a disputed provence),

Likewise, Dreyse Rifles produced the upset victory of Prussians over Austrians at the decisive Battle of Sadova during the Austro-Prussian War in the summer of 1866. Austrians had traditional muzzle-loaders. Prussians were armed with Dreyses, and the result, once again, was that the Austrians were annihilated!

So it was becoming pretty obvious to European (and American) war planners by this time that muzzle-loaders were really obsolete!

Back in the USA however, the War Department displayed no interest in breech-loading rifles, for general issue, as long as the Civil War continued.

These two over-the-top technology-enhanced victories represented an eery harbinger of The Siege of Pleven (present-day Plevna, Bulgaria), in 1877, where hapless Russian Soldiers, with their obsolete, slow-firing Krnka and Berdan Rifles, would be repeatedly mowed-down by Ottoman troops armed with Model 1866 lever-action Winchesters, which they had imported from America!

With regard to European history, the Franco-Prussian War of 1870, with its upset victory (once more) of Prussia (along with the rest of the loosely-unified Germanic states) over France, essentially created the modern nation of Germany, permanently uniting most German regions, minus Austria.

Prussia was the leading German state at the time, but the term was mostly dropped (in favor of “Germany”) after unification. After WWII, Prussia’s traditional territory was cut-up, some of it ending-up in Poland and Russia. There is no “Nation of Prussia” today, and the term is no longer used, save by historians.

The Prussians/Germans retained their Dreyses (the first “bolt-action” military rifle), that had served them so well, until 1871, when they were replaced with the single-shot, bolt-action, metallic-cartridge Mauser, the “Gewehr 71,” the invention of Andreas Mauser and his two sons, Paul and Wilhelm.

“Gewehr” translates to “rifle” in English.

“Karabiner” translates to “carbine”

“k” is for “kurz,” or “short”

Next came the Gewehr 84, with the addition of a tube magazine (still black powder, 11mm). The G84 came with a magazine cut-off switch, like most magazine rifles of the era.

The G88/K91 were next (the G88 for infantry, the shorter K91 for cavalry). Now box-magazine-fed (en-block clip), smokless 8mm (7.92×57) ammunition, but with a blunt bullet.

With the G98, we convert to stripper-clips, spitzer bullets (still 8mm).

The G98, and the later K98k, were Germany’s flagship military rifles through WWI and WWII, and enjoyed an excellent reputation that continues to this day, although production quality deteriorated as WWII progressed, just as it did in Japan!

The frantic arms-race between France and Germany was to continue well into the Twentieth Century!

/John

DTI in 2020!

19 Nov 19

DTI in 2020

Our 2020 training schedule is now current and published on our DTI Web Page, at
defense-training.com

Many Courses an many parts of the Country!

2019 prices on all 2020 DTI Courses, as long as you register by 31 Dec 19!

You can register easily and quickly, directly on our Web Page

We continue to passionately teach and advance our Art!

Plan on joining us!

/John

Appendix Carry

17 Nov 19

“Knowledge can be communicated, but not wisdom.

One can find it, live it, do wonders through it, but one cannot teach it.”

Hermann Hesse

“Appendix” Carry:

I’m not sure that appendix carry qualifies as a “trend,” but I’m seeing it a lot more of it than I did a decade ago.

With the whole idea of concealed carry still a “novelty” in many parts of the country, and so much of it being poorly and unsafely displayed in Hollywood productions, more than a few students of our Art are currently experimenting with the practice.

Simultaneously, holster-makers make available a never-ending variety of wares designed to accommodate appendix carry.

More than a few concealed carriers opting for appendix carry have accidentally shot themselves in the leg or groin!

Of course, during the same time period, probably an equal number of concealed carriers opting for hip carry have likewise accidentally shot themselves in the buttocks, but those wounds tend to be less life-threatening than with the former category.

I’ve been asked to comment on the practice, as I know respected instructors who don’t allow appendix carry in their venues!

Here are the main points:

1. Guns are dangerous! Risk attaches to all forms of concealed carry, no matter how careful we try to be. None are “risk free!”

2. The most dangerous thing we do with pistols, by far, is place them into holsters! Upwards of ninety percent of range/training accidents happen as the student is holstering/reholstering. It is at this moment that we must be most alert and careful, no matter the carry method for which we’ve opted.

3. Carrying a concealed pistol, for the purpose of personal protection, absolutely requires that the pistol be loaded! Carrying concealed, in any body location, where the pistol has no round chambered, represents foolish self-deception! Who are not prepared to carry a loaded pistol, are not ready for concealed carry at all, and shouldn’t!

When you produce your pistol during an emergency, who promised you that your support-hand will always be available? Is that a “given?”

When the practice of routinely carrying concealed, a modern, high-quality pistol with a round chambered, frightens you, my advice is to not carry at all, in any position, as noted above!

4. I ask appendix carriers to do two things I don’t of require those employing other carry options:

a. I ask students to holster only when standing up. I ask them not to holster while they are sitting (as in a car).

b. I ask students to thrust their hips forward slightly as they holster, insuring that only empty space (rather than their thigh or groin) is directly in front of their pistol’s muzzle as the pistol is seated in the holster.

5. As with off-body carry, appendix carry (with all its risks) not only represents an acceptable option. For some, it represents the only option!

Back to point 1:

I don’t think it is possible to handle, nor bear, deadly weapons “safely.”

I think we can handle them CAREFULLY! Even then, there are no guarantees.

The practice of routine concealed carry, in any form, is ill-suited for clueless snowflakes! Only the assiduous, serious, and sober need apply!

/John

Headspace

15 Nov 19

“Headspace”

The term, “headspace,” refers to the distance from the part of the chamber that stops forward motion of the
cartridge, to the bolt-face.

That part of the chamber is sometimes called the “datum-reference.”

When used as a verb, “to headspace” refers to the contact created between this part of the chamber and the feature of the cartridge that achieves correct positioning as the cartridge is shoved forward into the chamber:

1 Rim

2 Shoulder

3 Case mouth

4 Belt

7.62×51, 5.56×45, 6.8×43, and most other modern military rifle cartridges “headspace” on the shoulder of the brass cartridge case.

One can only wonder how this will all work with “composite” cases!

Old, mostly obsolete, military cartridges, like the 7.62x54R, 303 British, 30-40 Krag, are rimmed and headspace on the cartridge’s rim.

Most revolver cartridges, 38SPL, et al, are rimmed and headspace on the rim.

Most rimfire cartridges, like the 22LR, are also rimmed and also headspace on the rim.

When headspace is too short, the bolt may not close, nor lock.

When headspace is too large, the cartridge case may rupture, or the round may not fire at all

Most straight-walled rifle cases need to be rimmed, as the rim provides a safe and positive datum point.

Most straight-walled, autoloading pistol cases (9×19, 45ACP) headspace on the case mouth, as this suffices for normal pistol cartridge pressures. However, such pistol ammunition cannot have a heavy crimp on the bullet, as this creates a uncertain datum point.

When metallic rifle cases were first introduced, most were straight-walled and rimmed.

With the advent of smokeless propellant, shouldered cases became popular, and the shoulder made a positive datum point, so rims could be eliminated, replaced with a flush “extractor groove” (a virtual necessity with the advent of box magazines).

Some, like the Russian 7.62x54R, retained the rim, but mostly due to bureaucratic momentum, not ballistic necessity.

“Belted” rifle cases are a relatively new development. The term refers to a shell casing with a pronounced “belt” around its base that continues several millimeters forward of the extractor groove.

It originated with British gunmaker, Holland & Holland (H&H) in the first half of the 20th Century, and is found on their powerful, big-game African cartridges.

H&H engineers calculated that the belt would provide more positive headspacing than the cartridge shoulder. They were particularly concerned with cartridges with shallow shoulders being shoved too far forward into the chamber.

The idea was subsequently picked-up by some American gun-makers and ammunition manufacturers, like Winchester and Weatherby.

This “belt” slowly became something of a “standard,” expected on “magnum” cartridges.

On most modern, heavily and sharply-shouldered big-game rifle cartridges that still feature a belt, that belt is probably unnecessary, but of course, long-past any chance of correction!

/John

See the FSM4 Gen II in action:

Go to RobarGuns.com to get more details on the second generation of Farnam’s Signature M4 Rifle.

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