Posted: 1/24/2014 9:11:24 PM EDT
| I have a Colt Custom Shop M1991A1 that when the slide is dropped on an empty chamber using the slide release, occasionally (every 20-30 times) the hammer follows down to half-cock. Has never happened during live fire nor when using dummy ammo. I am the second owner, has between 3000-5000 rounds through it, but is babied and cleaned religiously. Is this something to worry about? I has a local gunsmith check it out and he couldn't reproduce the issue. I was thinking about sending it back to Colt to go through with a fine tooth comb. It is an occasional carry gun and much be 100% |
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I have a brand new COLT Series 70, 1911A in stainless (O1070A1CS) and has never done that in the past hundred+ times dry firing.
We also ran 700+ rounds this three weeks to gain reliability and muscle memory, all without the conditions you noted. In 1992, I had an Auto-Ordnance which did what you indicate your COLT is now doing. I sent it back to AO and they replaced the sear. Much luck! |
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Do NOT run the slide forward on an empty chamber without slowing it's forward movement, especially on one with a lightened trigger weight. It does not happen when actually shooting it because the slide is slowed by the drag of the round being taken from the mag and loaded into the chamber.
Why are you slamming the slide into battery repeatedly on an empty chamber so often? |
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There's two checks to make, one with your finger on the trigger and one without.
1 - With trigger pulled, lock slide back then drop slide with slide stop. Hammer should not fall. If the hammer falls, you have a disconnector problem. Ussually just a sear spring adjustment, but could be more. 2 - Without trigger pulled, lock slide back then drop slide with slide stop. Hammer should not fall. If hammer drops, you have a sear/hammer engagement problem. |
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Sounds like your trigger is bouncing against the sear due to inertia. Try holding the trigger forward and repeating the test. If the hammer doesn't fall with the trigger held forward, then
Quoted:
increase sear spring tension. specifically the middle finger of the sear spring. |