AD from M1911A1 Series 70 dropped on muzzle.

C

clem

Moderator
I am involved in a very detailed and extended discussion on the subject that Series 70 Colts and other like M1911A1s are not as safe as Series 80 Colts because of no "firing pin lock". The other side has gone as far as saying that current Springfield Armory handguns have a "safety concern". I am of the opinion that there is no AD firing pin drop problem with any Series 70 type M1911A1 pistols, as long as they are maintained with quality servicable parts. And especially none with the Springfield Armory handguns. I can not find any source / reference material that covers any drop testing of the weapons, any ideas? I do need some help in showing that the other side is full of mud.
Thanks,
Clem
 
I can't remember the name of the study, but this has been examined. It's possible, though highly unlikely, to cause the series 70 pistols to AD (or ND) if you drop them just right from a sufficient height.
 
IIRC, the US Navy studied the question and found a drop of about 15 feet was required to have the pistol fire with a muzzle down drop.
 
Hi, Clem,

Sorry to contradict you, but the 1911 type pistol does have a safety problem in that if dropped on the muzzle, there is enough firing pin creep to set off a chambered round. Whether the gun is cocked or not is irrelevant, as hammer fall is not involved. This is the problem that Colt addressed in the Series 80 and as other makers have also done.

As for tests, take a look at the NIJ report at this address:

http://www.nlectc.org/pdffiles/pistolsepr2000.pdf

That having been said, the cases of that type of AD happening are rare indeed. The pistol has to drop at just the right angle, at enough distance, etc. Most accidental discharges are due to user stupidity, not a failure of the gun or gun design.

Jim
 
While you can get an AD in rare instances by dropping a series 70 1911 on the muzzle, it's not likely. AFAIK, only Colt and ParaOrdnance have the series-80 firing pin block. I don't lose any sleep over my 1911 firing if I drop it, my Garands and AR-15's also suffer from the same "problem". :D
 
Jim,

Have to ask, just downloaded that file and actually READ it, the only gun that "fired" when dropped was a Sig 229. All 1911 pattern guns tested (Colt and Kimber) passed. The Colt was a Series 80, but the Kimber does NOT have the Series 80 style safety.
 
Jim & others, thanks for the info and source material. Now, if anyone knows of any reference to the FBI testing and accepting the Springfield M1911A1 for their SWAT & HNT agents, that would help.
I feel that if you put a Heavy Duty firing pin spring and a titanium firing pin in a series 70 Colt, you should be okay because titanium weights 62% of a like item made of steel. I have titanium in my Colts and the firing pin weight feels like it's a tooth pick.
Anyway, thanks again.
Clem
 
M1's a bit different

The sheer mass of the M1 makes muzzle-down discharge quite unlikely. Most surfaces, even concrete, will "give" a little when smacked by the muzzle, decreasing the relative decelleration of the gun/cartridge and the unrestrained firing pin.

A to-pound pistol is another matter. The M1911 drop-fire "feature" is quite rare, but I have read at least three firsthand accounts of such events, and references to maybe five more. Hearsay to you, but I believe it. The physics is sound, but don't ask me to run the calculations!
 
Look again at the Kimbers

The DOJ piece reports passive firing pin safeties on the Kimbers.

Note: The thick rubber mat makes it an "easy" test. They should repeat it using that fake-wood laminate flooring. It's essentially 5/16-inch tempered Masonite or particle board (depending on maker), over a 3/32" foam piece.

Much more likely to "jar off" a sear. Much more realisic test. How many dropped guns DON't happen on carpet?!?!?!
 
Interesting, thought these were production guns. The test was done in 2000. Kimber has just now started listing ONE model with a passive firing pin safety, and it isn't one of the ones tested. I KNOW that my Ultra CDP doesn't have one. That still leaves the question, the poster put this article up as "proof" that the 1911 has this problem, and the only gun listed that "fired" isn't a 1911 pattern gun. Whether the ones tested have firing pin safeties or not, what was the point of the posting of this article. As for the original question, yes, it can happen, IF all things happen just right (or wrong - depending on your point of view). The gun has to drop far enough, land on a hard surface squarely on the muzzle, etc. Since most 1911 pattern guns tend to be butt heavy (when fully loaded at least) I find it unlikely that they would fall far enough and then land squarely on the muzzle. Certainly not going to worry about it myself (and neither of my 1911 guns has the firing pin safety).
 
Cheapo, we'll have to agree to disagree about all the other military guns that don't have any firing pin lock. I don't know about the concrete around your way, but around here it doesn't give much from a 2 pound gun or a 10 pound gun! How about my 5 pound M1 Carbine? Or, perhaps the 6 pound AR? I also have a problem with all those AD's from dropped 1911's that you claim. If I knew that many clumsy people, I'd move. :D

As far as firing pin safety's on Kimbers, I own one and have looked at lots of different models, and I've yet to see one with a firing pin safety. There may a gun equipped with one in their product line, but it's sure not a common feature of most of their guns.
 
Kimber's 2001 catalog describes how their models will be phased in with the 'series' II modification. It uses the compression of the grip safety to disengage the firing-pin safety plunger. Therefore, this design will not hinder a really good trigger pull as it can in the Colt's.

IIRC, the old Army testing showed that the 1911 must be dropped from a height of 21' feet onto a hard surface to generate enough inertia for discharge. But, what if your firing pin is slightly overlength? Or, your firing pin spring is old/weak. What if this is present in a gun with a tuned target trigger, with a minimum of sear/hammer engagement? Hmmmmm, that changes things a bit, yes?:D

A Muzzle down discharge doesn't seem to be much of a concern. Afterall, isn't that a relatively safe direction for the bullet? Unless, of course, you are on other than the bottom floor or deck of a ship.:o What if it were to land on the tang of the grip safety, with the muzzle UP?
 
Attaching a firing pin block to the grip safety would seem to remove 1911 compatibility for a bunch of parts... I'm not sure I'd be that eager to buy a Kimber if they do that to them...
 
Johnwill, I said that I've READ firsthand accounts. Never been there for one. Don't plan to.

I really like the idea of linking the firing pin safety to the grip safety. The only disadvantage, which really doesn't apply to the M1911 unless you're silly enough to want to carry it chamber loaded, hammer down, is that you must release your grip safety while lowering the hammer in order to get the safety margin afforded by letting off the trigger after releasing the hammer (as on a Series 80 Colt or any modern revolver).

As I understand the physics, the "give" and compression/flex of and friction between the many parts between the muzzle and the firing pin, as well as possible deformation of the muzzle's metal and crunching of the concrete, will ALL combine to absorb some of the impact energy and make less firing pin energy available to set off a chambered rifle round.

But I do agree that a muzzle-down rifle with floating firing pin (or even with a return spring like some AKs) WILL go bang if dropped from a sufficient distance. Anyone know how far of a drop it takes?

Read the DOJ report where it describes the rubber mat. ONE INCH??? Hardly realistic.
 
I recently replaced a barrel in a 1911, (I believe it was an 80 Series). The owner claimed that he'd dropped the pistol on his concrete garage floor and that the pistol went off. The end of the barrel was bulged so much that I had to cut the barrel off to remove the bushing.

I didn't really believe the story, but don't have any other theories as to how the barrel was bulged. There's a possibility that it's a 70 Series. It was a nickled Government Model, whatever it was.
 
VictorLouis,

Talking two different types of AD here. The original reference was to the inertial firing pin going far enough forward under impact to fire a chambered cartridge. Action had nothing to do with anything. You are talking the hammer falling off the sear. Assuming proper maintenance and fitting (no home gun smiths please), a working grip safety, a working thumb safety, and proper half cock notches the second should never happen. If it does someone has butchered up the insides of the gun in more than one area.
 
Hi, SW627pc and guys,

Sorry for the misunderstanding. I cited that NJ study because they did the drop test and one gun failed, not because most guns passed. The situation, as I noted, is rare, but it can happen. My 1911 type pistols are all pre-Series 80 and I don't worry about what happens if I drop one because I don't go around dropping my guns. As I said, most AD's are due to human error, not to any deficiency in the gun.

The idea of having the firing pin block operated by the grip safety is an old one, patented in 1937 by William L. Swartz. Colt made it standard on commercial Colts of that period, but dropped it during the war as it was not required on military production. After the war, they chose not to revive the idea and used a different design in the Series 80. The Swartz safety has been removed from many of the guns that originally had it, but a round hole beside the disconnector on the top of the frame and a corresponding hole in the slide show where it was. It does not affect the trigger pull and the shooter does not even know it is there.

Jim
 
I find it interesting that the barrel was "bulged". Was it bulged right at the muzzle? Don't you think the round leaving the barrel would kick the pistol muzzle off the deck? I've seen bulged barrels in my Marine Corps armorer days and they were mostly caused by, 1. another round in the barrel that was stuck (squib load), 2. oil or other fluid in the barrel (hydrostatic compression), or 3. something else in the barrel (patch, bug, mud). Now I know, anything can happen and I know we all have seen some strange stuff, but................? Oh well.
Clem
 
Early Colt Pistols dropped for test

First, an "accidental discharge is caused by a part failing and the weapon firing, such as happens with a loaded and locked Luger when the projections on the firing pin shear from fatigue and the gun discharges. "Unintentional Discharges are caused by human error.
I have made personal drop tests, with a mechanical engineer from two different heights. In 1,000 drops from the height of a Chevy Blazer, as would happen if your pistol fell to a hard surface as you got out only four drops resulted in a hit squarely on the muzzle. All four resulted in a faint primer dent.
1,000 drops from a tall ladder to a gravel driveway resulted in onoly one hit directly on the muzzle and another light firing pin dent in the primer. A slightly heavier firing pin spring would have negated the denting of primers.
FIguring it out using the law of physics, it requires a direct hit on the muzzle from five stories to cause ignition with a standard, (worn out) G.I. firing pin spring.
Mostly, air pressure will prevent the pistol falling muzzle first, and proper maintenance will take care of the rest.
All of the U.S. Services have carried 1911 pistols for most of the 20th century. To date, I have been unable to find a case history of a dropped pistol firing. Several who claimed this happened were proved to have been caused by other circumstances.
I know of only one authenticated case under very unusual circumstances, where a hunter threw a loaded, locked 1911 at a "rat" in the corner of a log cabin resulting in a fired shot. The pistol was mine, but the thrower was not yrs truly. The "rat" was a terrified little squirrel and the firing pin spring was installed in the pistol by the COlt factory in 1917; the incident happened in 1993. The pistol was thrown end over end, hit squarely on the HAMMER. Evidently, rebound from the firing pin stop was sufficient to propel the firing pin hard enough to ignite the round.
Since I was not present, I cannot vouch for the veracity of the facts, and I have no idea what role Jack Daniels played in this.
If I wanted to, I could perform a set of drop tests with the notion that "I'm gonna make this sonofagun fire" and probably get ignition, but all lyou have to do is drop your old .45 1000 times from 15 feet to see that the Navy test was flawed. ANy test, to be believable, must be duplicated at will with identical results. Try it yourself.
 
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