Posted: 11/29/2008 2:35:43 AM EDT
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ETA: Resolved. The gunsmith put in a new hammer. sear, and disconnecter, which cleaned up the issue. The firing parts didn't look damaged or excessively worn, but obviously, something was off with them...
So my MC Operator is having some 'issues': 1) Grip safety NOT engaged, pulling the trigger does NOT drop the hammer from either full or half cock. (Good) 2) Grip safety engaged, hammer falls normally from full cock. (Good) 3) Grip safety engaged, hammer falls from half-cock. (Bad?) 4) Pulling hammer back just short of full-cock and releasing it, it does NOT stop at the half-cock position. (Very bad?) I have no problem pulling the hammer back to the half-cock, but it won't catch there when the hammer falls from just short of cocked, and I can pull the trigger and drop it from the half-cocked position. Not good. I looked at the hammer and sear, and both look good, with sharp and clean engagement points. When I mount them on the outside, it looks like the sear has plenty of contact surface with the cocking notches on the hammer. I'll be taking it to the gunsmiths on Monday (I'm comfortable doing some stuff on it, but when safety systems ain't working...) but what says Arfcom? Weak sear spring maybe? I can't see what else it would be, but then again, I'm not a gunsmith... |
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Many(all?) Springfields have a halfcock "shelf" rather than an actual hook. The hammer will drop if you pull the trigger while it is halfcocked.
The good news is that you don't really need a halfcock position at all if you are using the gun properly. If you really want it, replace the hammer with one that has the hook. |
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Quoted:
Many(all?) Springfields have a halfcock "shelf" rather than an actual hook. The hammer will drop if you pull the trigger while it is halfcocked. The good news is that you don't really need a halfcock position at all if you are using the gun properly. If you really want it, replace the hammer with one that has the hook. I was just reading about that over at M1911. I guess that doesn't bother me as much as the fact that the hammer isn't catching on the half-cock notch (shelf?) when it falls from just short of full-cock. I don't use the half-cock position for anything, but from my understanding it should function as a safety-net if the sear is damaged, releasing the hammer. Nothing was done to it, short of a detailed cleaning (complete dissassembly) a few weeks back. I tested my usual 'cock hammer, pull trigger with thumb and frame safety on/off', but last night was the first time I thought to check half-cock functionality. ETA: Tried a new Ed Brown sear spring, no joy. Ah well, worth trying, I suppose. The hammer doesn't follow the slide if I hold down the grip safety and the trigger and rack the slide, and I can definitely hear the 'click' as the hammer and the sear pass the half-cock notch. I can lower the hammer from full to half at a moderate speed, no problem. I can raise it to the half-cock, no problem. But when I let it go 'full speed' from the full cock (finger off the trigger), it doesn't catch it at all. Well, guess the gunsmith is gonna earn his keep afterall. 
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Quoted:
Many(all?) Springfields have a halfcock "shelf" rather than an actual hook. The hammer will drop if you pull the trigger while it is halfcocked. The good news is that you don't really need a halfcock position at all if you are using the gun properly. If you really want it, replace the hammer with one that has the hook. Interesting.... My Springfield came from the factory with a captive half-cock hook, rather than just a shelf. Half-cocked= trigger pull doesn't do anything. OP, take a look at your hammer, maybe think about replacing it with one that has a captive notch or hook at the half-cock position. |
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My Springfield has a half-cock and a shelf. My Nighthawk just has a half-cock. Neither of them will drop the hammer if on half-cock.
The "shelf"on the Springfield is a few degrees from the uncocked position and will drop if the trigger is pulled but with nowhere near enough force to cause the firing pin to do anything. Both the half-cock and shelf will catch the hammer. I'd say something is wrong with your hammer if it is falling from half-cock when you pull the trigger. Springfields don't have a series 80 firing pin block, so they definitely should not be falling on half cock. |