I own a number of 1911s as well as a number of DA/SA pistols including various CZs with and without decockers, a couple S&W 39s, a 6906, several PP series pistols, a P.38 and a few uncommon FN pistols that experimented with more of a hybrid approach.
I've carried various 1911s since I first started carrying concealed at age 21 - 35 years ago. I've carried a 1911 for the majority of that time and I conceal carry all day, every day.
Carrying a 1911 in condition 1 (cocked and locked with a round in the chamber) is by far the safest way to carry it. Carrying one in
Condition 2 (hammer down, safety off, on a loaded chamber) is by far the least safe method. Under stress you'll be using fine motor movements to try to cock the hammer without letting it slip, and you also have to successfully decock the pistol by lowering the hammer every time you do an administrative reload.
Condition 3 (hammer down, safety off, on an empty chamber) is safer than condition 2 as you are not putting a round in the chamber with each administrative reload, and readying the pistol for action under stress is done with large motor movement to rack the slide. The downside is that it is very slow. It has an undeserved reputation for being safer than Condition 1 due to policies some military units have in terms of requiring pistols to be carried in condition 3. But most military personnel are not using a service pistol in conditions where there is no prior warning of a threat, and many of the militaries that specify racking the slide to ready the pistol for action have multiple types in service. The IDF was a prime example as they needed a manual of arms that worked for a wide variety of surplus pistols in service.
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In terms of carrying a 1911 cocked and locked there are several safety benefits.
1) you never need to manipulate the hammer or rely on a decocker after an administrative or tactical reload. You just apply the safety. Period.
2) unloading is also straight forward. Drop the magazine, click the safety off, rack the slide to eject the round from the chamber and then visually inspect for an empty mag well and empty chamber. That's not significantly different than clearing a DA/SA pistol.
3) assuming you use a proper holster that covers the trigger, the pistol is still safe even in condition 0 (hammer cocked, safety off, on a loaded chamber).
4) the 1911 is one of the safest handguns to holster or reholster.
- as long as the grip safety is not depressed, the sear is still locked. Even if the safety some how came off (or you forgot to put it on safe), the pistol still will not fire even if there is an intrusion into the trigger guard that causes the trigger to be pulled as you reholster.
- you can also use your thumb to press forward on the top of the grip safety to ensure it is not depressed.
- alternatively you can hold your thumb over the top of the hammer. If you press too hard you will deactivate the grip safety, but the hammer is still under your control. If you hold the hammer without pressing it back, you have full hammer control plus the grip safety, plus the manual safety all preventing an AD while reholstering.
You don't have the same protection against an intrusion into the trigger guard when reholstering with a decocker equipped DA/SA pistol, unless you have a pistol with a decocking lever that is also a safety (I.e. the lever stays in the decocked position when you release it). Even then, you have to reach between you and the pistol to deactivate the safety to make the gun ready to fire.
The sad fact is that nearly all decocker/safety lever equipped SA/DA pistols have a lever that has to be moved up to take it off safe. It's much harder to do that with your thumb during a draw, which means most people are carrying a decocker equipped DA/SA or DAO pistol off safe, relying on good trigger discipline and the long and heavy DA trigger pull for safety during the actual draw.
They are still way ahead of the people carrying striker fired pistols with all the safeties tied to the trigger. In most cases it's also a trigger with a much shorter and lighter pull than a DA/SA pistol. Those pistols *are* an accident waiting to happen and they happen on a comparatively regular basis.
The results of those accidents are somewhat unfairly called "Glock Leg". Most Glocks can be equipped with a device on the back of the slide that prevents the final movement of the striker when it is pressed, which reduces the trigger guard intrusion risk when reholstering. However they are still no where as safe to reholster as a 1911.
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With a DA/SA or DAO pistol you need to hold your thumb over the back of the hammer to enable you to feel the hammer coming back if something is intruding into the trigger guard when you holster or reholster the pistol. Same with a DA/SA revolver.
How many shooters actually do that?