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Posted: 7/6/2010 11:50:44 AM EDT
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So I was out at the range the other day when I decided to try slapping the bolt release on a fresh mag. Everthing seemed to slide together fine but when I pulled the trigger- click. Hmm... I thought. Maybe a bad primer. Tried to pull the charging handle back and it was stuck. Wasn't sure what to do next, but eventually I decided to pull the pins and reset the trigger manually. Bang. Worked fine and fired off the rest of the mag fine. Did it again and same issue, bolt stuck tight. However if I released he bolt with the charging handle, everything went fine first time.
Now I'm wondering if it's bad technique, or if there is a problem with the gun. Any tips from you pros are greatly appreciated. |
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Problem with the FCG, hence when you bang the bolt hold open lever, the hammer is being danced off the trigger sear, and what is causing the lock up.
If a new gun, go back and check the springs to make sure that they are wind direction installed correctly. Also, are you sure that you are not pulling the trigger as you go to bump the catch lever? |
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Quoted:
Problem with the FCG, hence when you bang the bolt hold open lever, the hammer is being danced off the trigger sear, and what is causing the lock up. Not sure I see that as, 1) the gun went click, which it doesn't when the hammer follows down and, 2) the hammer being down shouldn't lock the gun by itself, or else you wouldn't be able to manually cycle with the charging handle in the case of a failed firing pin strike. Unless you're meaning something else that I'm not thinking of. @OP How clean was your bolt and carrier? Have you tried it since cleaning? Perhaps the inside of the carrier is full of carbon around the bolt and that's increasing friction and by extension bolt effort. Maybe your gas tube or key are slightly out of alignment causing more friction, maybe the ammo is slightly long causing more pressure against the locking lugs and increasing friction. Gas pressure would exert more pressure and force past it (if any of those are even the answer.) I've seen this before on my friends gun and it was only using a certain kind of ammo after firing many rounds so it was very hot. That was the only time it happened, when hot. |
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Ok. As far as I can tell, the gun is pretty clean all over and I am shooting my reloads (which so far I have had no trouble with and are giving me 2-3" @ 100yds, iron sights).
It did occur to me that if I reach under with my right hand and push the slide release with my index finger (I'm a lefty), I have no problems either. Only seems to happen if I "slap" it. I'm thinking maybe it's just bad practice (akin to ramming a mag into a Glock) but I've seen others do it no problem, and it does seem to be an expedient way to recharge your gun. Oh well- BTW, it is a build, I bought from a friend, Oly (I know) upper and lower, Eagle Arms SS barrell, and sombody's (forgot) 2 stage trigger. It is otherwise 100% reliable. |
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With the hammer staying back, best guess then is the hammer is catching the FP collar, and not allowing the bolt to fully lock up.
So if that is the case then, 1. the trigger is out spec and needs to be replace (too short from the pin location to the front of the trigger sear, and not holding the hammer low enough at sear retention), or you just need to bevel the top corner of the contact pad to lower it a tad. 2. The firing pin collar is above the carrier ramp and allowing the hammer catch, meaning that the collar OD needs to be reduced (spin filing will work for this). |
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