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Posted: 5/18/2014 1:55:08 PM EDT
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I got a 84s that was new in box until until I popped its cherry. I've been to the range twice since I've got it and each time it has doubled on me and this time even tripled on me until mag was clear.i took it home cleaned it and the bolt with nothing out of the ordinary.
I've read that others have had these slam fires and there seems to be no clear conception of what the problem could be. I've found only one brass from this range trip and it has what appears to be a small piece of primer from a previous round attached to the primer of the round that had a fte. I've also noticed when I first got this rifle if you chamber a round and then unload the round from the chamber the primers seem to have light primer strikes on them unfired. Who else has had this issue. Any way here's some pics of my ok shooting trip and pics of the brass I ejected from the gun on the double slam fire. You'll notice the raised piece of brass off the rear of the primer and how it doesn't stand when sitting on end. 
Primer has a outty not a inny I think it's a piece of the previous rounds primer stuck to the primer causing to fire slightly out of battery causing a failure to eject 
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Have you tried different ammo?
Have you cleaned out the firing pin channel of any dried grease? Dried packing grease/cosmo often gets in there and can get the firing pin stuck, causing slam fires. Since you are the first shooter this would make the most sense as a cause. |
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Quoted:
I cleaned this firearm completely before firing there is no grease on it Hmm. I see you used different kinds of ammo, so that rules that out. Maybe try another trigger group and see if the problem persists? Would be a shame to lose that Chinese FCG though. |
You may have a bad case of the dreaded sharp firing pin hole syndrome. I was 2 for 2 on Chicom 5.56 rifles. MAK 90 would not fire steel case ammo w/o cutting out a nice little disk of the primer which would eventually clog the bolt and stop the gun. NHM 90 -- same problem but not to the same degree. After going through the whole diagnose bit - a stronger spring stop the slam firing you can't imagine how many broken shells can come out of a gun w/o damaging it , but didn't cure the incompatibility with steel case ammo. Also anything with a non mil spec or magnum small rifle was still no go. Solution was to bevel the edges of the firing pin hole on the bolt face. Turns out the edges were so sharp thinner primers would just slice out the center. Got the idea from the slide face on a Beretta 96, believe it or not. Some AK74 bolts also have a beveled FP hole, so I can't take credit for discovering the issue, just a reinvention of the wheel .
What you see on you primer is most likely primer flow due to high pressure and not part of a previous primer piece. Stick to m193 and 855 an you should be ok. But I'd recommend a stiffer FP spring and rounding the edges of the FP hole. I never understood why more Chicom 223/556 rifle owners never had problems. |
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You may have a bad case of the dreaded sharp firing pin hole syndrome. I was 2 for 2 on Chicom 5.56 rifles. MAK 90 would not fire steel case ammo w/o cutting out a nice little disk of the primer which would eventually clog the bolt and stop the gun. NHM 90 -- same problem but not to the same degree. After going through the whole diagnose bit - a stronger spring stop the slam firing you can't imagine how many broken shells can come out of a gun w/o damaging it, but didn't cure the incompatibility with steel case ammo. Also anything with a non mil spec or magnum small rifle was still no go. Solution was to bevel the edges of the firing pin hole on the bolt face. Turns out the edges were so sharp thinner primers would just slice out the center. Got the idea from the slide face on a Beretta 96, believe it or not. Some AK74 bolts also have a beveled FP hole, so I can't take credit for discovering the issue, just a reinvention of the wheel .
What you see on you primer is most likely primer flow due to high pressure and not part of a previous primer piece. Stick to m193 and 855 an you should be ok. But I'd recommend a stiffer FP spring and rounding the edges of the FP hole. I never understood why more Chicom 223/556 rifle owners never had problems. User InfoIM UserEmail UserReplyQuoteReport I agree this may be the issue because the piece that is stuck to the primer is the size of the firing pin hole |
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