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62. Most modern handguns with a few exceptions are drop safe. ...

Accidental discharges where the trigger snags on something usually involve handguns that are not in properly designed holsters. In my opinion there is not real reason for an honest citizen to not use a quality holster that protects the trigger. Criminals usually avoid holsters as they often throw a gun away while chased and don't want the cops to catch them with an empty holster.

Accidental / Negligent discharges
by Frank Sharpe
Fortress Defense Consultants

Q: Frank, could you address the idea that guns just go off? On the news they say, ‘the gun accidentally went off.’ I would love to post something from an expert debunking this scary thought!

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In answer to your question, the vast majority of handguns manufactured in the last 100-years are certified as “drop safe.” Meaning, they have, in a laboratory, been loaded with a primed case and test dropped onto concrete from varying angles to determine if they will fire. The Department of Justice Height Standard is 1-meter + 1cm; states such as MA and CA have their own standards (of course.) Some firearms, however, are not drop safe. The old single action Colt revolvers we’re used to seeing in all the Hollywood westerns are on that list. It was common practice in those days to carry an empty chamber under the hammer to prevent an accidental discharge of the pistol should it be dropped and fall directly on the hammer. Along with those, there are pistols like the 1903 Colt .32, and the first batch of Colt 1911 pistols up until 1930, and then again from the onset of WWII till the Series 80 1911′s went into production. The old-style 1911 pistols can have an “inertia discharge”, meaning you drop the gun and it hits the ground in just the right way that the weight of the firing pin overcomes the firing pin spring pressure and strikes the primer of the chambered round. This is a very rare occurrence on a 1911, and is usually kept at bay by replacement of the firing pin spring every 4000 rounds, or so.

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There are rare pistols such as the Japanese Nambu Type 94 pistol, which is a WWII era gun with an exposed sear. This usually resulted in the pistol discharging when being holstered, causing a large portion of the Japanese officers who carried it to have a bullet wound crease down the side of their leg. They are an absolute death trap and should anyone find themselves in the presence of one, DO NOT LOAD IT! Also, most common sporting shotguns like the Remington and Mossberg pump action shotguns are not drop safe. They have no internal firing pin block, but only a simple trigger block safety. This can result in an inertia discharge of the gun if dropped or struck directly on the buttstock with a large enough force. One of the most common hunting accidents is a shotgun being dropped butt first from a tree stand and discharging as it hits the ground, thus wounding the hunter above. Because of this, in our shotgun courses we carry our shotguns slung with an empty chamber, and only chamber a round when immediately deploying the gun towards a threat. With defensive long guns, one may have to struggle with an attacker to retain the weapon, or actually use it to strike, hence our empty chamber policy during shotgun carry

All that being said, the odds of ANY gun firing because it was dropped on the ground are very slim, and the vast majority of pistols we see hit the ground and discharge in movies are drop safe guns that would not do so in real life. And odds of a gun firing without being dropped are a statistical zero. Where all this fits with your question is this: When it is reported that a person’s gun “just went off”, it didn’t. All claims of Accidental Discharges (AD’s) are investigated exactly as that. However, once investigated, 99.9999999999999% of them prove to be Negligent Discharges (ND’s.) Idiot had his greasy finger wrapped around the trigger, pressed it, and the gun worked just as advertised. Once in a while a foreign object gets tangled in the trigger, but it all still comes down to human error and/or improper gun handling. Most of the time when there is an ND, the victim(s) will claim that they didn’t do anything to cause it, and in their minds they are absolutely correct! Most people do not know or understand that they interacted with the gun to cause it to fire, and they will honestly believe that it “just went off.” But we know better, and once the facts are established it is proven as such.

That’s not to say there could not be a 1 in a billion chance of a mechanical malfunction of a gun, but it’s rare. It’s not unheard of like a unicorn, but it is much rarer than a white rhino. The idea of a gun simply discharging as it sits on a table, or even in a person’s hand, without the trigger being depressed, is a fallacy. It just doesn’t happen.
http://www.gunssavelife.com/?p=5573