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Posted: 6/27/2014 3:34:23 AM EDT
I'm shooting my 14.7" carbine frankengun yesterday and at about round 35 the hammer freezes in cocked position and the trigger won't fucking release the hammer!! 
RO comes over because he sees me pissed off and can't unfreeze the hammer either. That's it for the shooting.
I get home disassemble the halves and push down on the disco and move the trigger around and a fucking small piece of metal comes out and now the action functions well again. I have no idea what that piece of metal could be other than maybe a piece of the tip of soft point ammo I was using up. (It is old ammo.) Never had that happen before. |
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This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA
ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? |
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why not drop the mag, clear the weapon, pull the upper, stand back at a work bench and clear the jam? I had brass from a primer do that with a barrett lower and I cleared it and was back shooting in 5 I ended up doing that entire method at home. I have never had this happen before and simply did not know what was going on. ETA: This is a frankengun I built and haven't shot much so I thought maybe I fucked up somehow and never even thought about debris in the action. |
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This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. |
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It was most probably from a blown primer. I had the same thing happen to me several years ago. Yeah, happened to me too. I was firing my RR Colt and it locked up. First thought was "I have screwed up my machine gun!" 
Pulled it apart and there was the primer. Whew! |
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How would I know? Would the primer blow into smaller pieces because that piece was small? Quoted:
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It was most probably from a blown primer. I had the same thing happen to me several years ago. How would I know? Would the primer blow into smaller pieces because that piece was small? Yes, it usually fragments. I've seen it several times. What ammo were you using? |
Think positive dude - you learned something! 
I have seen highpower shooters, even USAMU team shooters, banging their lower on the mat to get a primer out from under the trigger at matches and at Camp Perry. My friend (and HM shooter) Ray Brandes hogged out his lower around the trigger shoe opening so the primers would just fall out! 
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| I had the same thing happen on my newly built SBR. I had shot a hundred rounds or so and went to let my brother shoot and he fired then *click*. Pulled the bolt back and a piece of primer fell out. Went to shoot again and the hammer wouldn't fall. Found out another piece fell down and wedged itself in there. |
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Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Quoted:
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This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Get a primer in your gas key.
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Get a primer in your gas key. Quoted:
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This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Get a primer in your gas key. Or one mashed in your locking lugs with a live round in the chamber. Cleaning rods FTW. |
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Or one mashed in your locking lugs with a live round in the chamber. Cleaning rods FTW. Quoted:
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This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Get a primer in your gas key. Or one mashed in your locking lugs with a live round in the chamber. Cleaning rods FTW. Had a M2 lock up at an ASV range like this. I was the only small arms master marksman in my unit so it was me who was smacking the bolt with a flathead and a hammer from a striker pioneer kit, contemplated there being a live round stuck on the bolt face before I freed the action and saw the in fact was a huge 50 cal live round looking at me like "what?" |
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Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Quoted:
Quoted:
This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. I had it happen to me after only getting 3 rounds through a new build of mine. Thought I had fucked something up too. Ended up being a piece of the rim of the casing my extractor had ripped off. Damn steel case ammo.
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Quoted:
This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Looks like a waste of $8.00 to me. Why not just learn to remove the offending piece at the range. Dan |
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Get a primer in your gas key. Quoted:
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Quoted:
This is a fairly common occurrence with ARs. DPMS makes a plastic guard they call a Receiver Rug to prevent the primer from dropping down into the Lower cavity. You can get them here: DPMS Receiver Rug at Midway USA ETA: It could have been a freak thing with a small piece of shaved brass too. Who knows? Thanks for the info. I've had junk go into the receiver before but never had it totally jam the action. I just never experienced it before, wish I knew what you guys knew while I was at the range. Get a primer in your gas key. Had something similar happen to me at a Highpower match at Camp Blanding in the late 90's. It took an AMU Armorur, Hammer and brass punch to get the bolt carrier to even move. Darn thing was locked up and not going anywhere without some convincing. Dan |
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I've had the primer mashed into the barrel extension's lugs with a live round chambered, the primer stuck in the fire control group, and even a primer anvil stuck between the bolt carrier and upper receiver.
A little thought and a BFH took care if it, though. In each case, it was a RRA shooting XM193. |
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I've had the primer mashed into the barrel extension's lugs with a live round chambered, the primer stuck in the fire control group, and even a primer anvil stuck between the bolt carrier and upper receiver. A little thought and a BFH took care if it, though. In each case, it was a RRA shooting XM193. Ditto to all three. Locked up my Gisielle HS match trigger with a primer two weeks ago. I had to take it out of the lower. It was jammed up tight. I'm not a big one for tearing them down out in the desert if I can defer it. Greg |
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Ditto to all three. Locked up my Gisielle HS match trigger with a primer two weeks ago. I had to take it out of the lower. It was jammed up tight. I'm not a big one for tearing them down out in the desert if I can defer it. Greg Quoted:
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I've had the primer mashed into the barrel extension's lugs with a live round chambered, the primer stuck in the fire control group, and even a primer anvil stuck between the bolt carrier and upper receiver. A little thought and a BFH took care if it, though. In each case, it was a RRA shooting XM193. Ditto to all three. Locked up my Gisielle HS match trigger with a primer two weeks ago. I had to take it out of the lower. It was jammed up tight. I'm not a big one for tearing them down out in the desert if I can defer it. Greg Off topic update: After learning something that everyone appears to have known about debris blocking the trigger on rare occasions other than me, I decided to try one of those ALG triggers for this truck type frankengun. Not a bad trigger at all. Zeroed in the carbine at the range and it is now going to be the house carbine. |
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