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Posted: 4/25/2004 11:07:37 AM EDT
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I was at the range yesterday shooting an Olympic Arms stainless 11.5 barrell with a 5.5 flash hider. It has a chromed bolt carrier and bolt. We were using my reloads with H322 powder. My friend was shooting and had 3 slam fires. I checked the bolt and firing pin for debris buildup but it looked fine. I shot the rifle and had a 2 round burst. I checked the lower firing group and the bolt at home and found nothing that would account for the bursts. I thought maybe the tolerances might be a problem with the chromed bolt carrier / bolt but I could not find any problems when it was dissembled. I've changed the carrier and bolt to a standard one but have not fired the rifle yet. Any ideas on why the multiple rounds firing? |
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Slam firing and what you describe are two different things. ARs essentially never slam fire unless your ammo was reloaded with extremely soft cupped pistol primers. Your problem (where the rifle "doubles") is because the disconnector timing needs adjustment or the disconnector hook on the hammer is worn or the tip of the disconnector hook is worn. |
| I have started having the same probelem. I'm not a gunsmith so should I just bring it to the local shop and have them put in a new FCG for me? Actually I guess that is a retorical question. I've tried doing a function check and it passed that, a smith is the next step I guess. |
You locked the bolt back on the catch, held the trigger back and let the bolt slam closed, without the disconnector retained the hammer without it jarring off during the impact. You cocked the hammer onto the disconnector with the trigger held back, and then very slowly released the trigger? The hammer was retained by the trigger sear, and not deflected off the trigger sear to allow the hammer to strike the firing pin during hammer reset? You have pulled the bolt fully apart and used a q-tip to clean the firing pin channel? Slam fire is when the firing pin/channel is full of crap and the firing pin is retained all the way forward in a fixed position, Added: a soft primer is used or the primer is not fully seated and the firing pin alone (under it's own weight/force) strikes the primer and ignites it (hammer still retained back and out of play). Disconnector slip is when the disconnector does not retain the hammer during either bolt closer (impact) or at trigger reset when the hammer is released from the disconnector and misses the trigger sear to be retained. |
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