Posted: 10/25/2010 5:13:27 PM EDT
| I have a SA 1911a1 that when at half cock the trigger can drop the hammer. What should I look at or replace in order to stop that from happening?? The Kimber Ultra Compact and other Kimber Custom II went to half cock and I could not drop the hammer... Please mind you, I'm saying that the hammer drops from the half cock position as if you were shooting the gun normally. |
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I don't know what TeeRex is talking about, but yes, the springfield will drop the hammer from "half cock" (wich I think is 1 of 2 clicks) It will not have enough energy to discharge the weapon though. Read your manual, it's all in there. GI style/GI spec. 1911 shouldn't drop the hammer from half cock. It's just a differant style of hammer notch. The only purpose of half cock is to catch the hammer if your thumb slips while manually cocking it, or some sort of catasrophic failure of the full cock notches.
ETA: when I said "GI" I don't meen Springfiel GI model, I meen real US government issue 1911/a1. |
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Not enough force will be generated to fire the weapon form 1/2 cock, your fine. Willing to put it to your temple and test this theory? Not me Would you do that to test the grip safety or thumb safety? Or anything else? Can't believe a person would be this stupid to even sugest something like this. Stupid will fix itself. |
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Not enough force will be generated to fire the weapon form 1/2 cock, your fine. Willing to put it to your temple and test this theory? Not me Would you do that to test the grip safety or thumb safety? Or anything else? Can't believe a person would be this stupid to even sugest something like this. Stupid will fix itself. I wasn't suggesting he do that. I was trying to illustrate to him the illogic of his statement. I wouldn't test the airbag in my car by ramming a bridge abuttment at highway speed, and I wouldn't test any safety feature on a handgun by pointing it at myself/you/that guy. |
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Guns with a half cock shelf will allow the hammer to fall form half-cock.
The shelf is NOT captive like the older designs. It is an attempt to prevent damage to the nose of the sear from if the hammer comes off the full-cock notch. The captive half-cock can smash the nose of the sear. Try it at the range or with a primer only case. |
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When Colt introduced the Series 80 firing pin lock system, they changed the "half-cock" notch to a simple flat shelf.
The half-cock/shelf is actually an interceptor notch or shelf. The purpose is to catch the hammer and prevent the gun from firing if the hammer falls from full cock somehow. As example if you fumble cocking or lowering the hammer, or the hammer gets struck hard enough to break it or the sear and it falls. In the Series 80 design, if you put the hammer on the notch and pull the trigger, the hammer will fall. However, notice that the Series 80 holds the hammer just barely off the firing pin, unlike the old half-cock which held it much farther back. When the Series 80 came out the NRA Dope Bag Technical Staff tested it by putting a primed case in the chamber and repeatedly putting the hammer on the shelf and pulling the trigger. The firing pin would leave a tiny dimple in the primer, but after something like 20 drops the primer never fired and the dimple was still tiny. Still, never trust anything. |
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Not enough force will be generated to fire the weapon form 1/2 cock, your fine. Willing to put it to your temple and test this theory? Not me or you could just shoot it from half cock at the range next time to see if it actually fires. 
Then we will all know for sure  .
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Newer (roughly 2002 and newer) Springfield's actually have 3 notches, not just the half cock and full cock. They will fall from the first notch. That's normal. Posted Via AR15.Com Mobile + 1. The cocking position being referred to in the OP is probably more like a "1/4" cock position, rather than 1/2 ... and yes, it will fall from that position. It is not designed to not fall from there. The hammer that Springfield just installed on my 1911A1 has the 3 notches that WIZZO referred to in his post above; and the new hammer replaced a hammer that had only two positions, which were "1/4" cock and full cock. |