AR Sponsor
Posted: 4/26/2008 6:09:22 PM EDT
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I'm fairly new to AR's and this is my first build. Here's the issue I having and I hope one of you guys can help. When I manually work the bolt - as in chambering the first round. The rifle will fire, extract, exject and chamber the next round without a problem. Then when the trigger is pulled only a click. When I manually work the charging handle and extract the round, the firing pin has left a very faint mark on the primer. This is consist issue, not firing the second round. Any ideas? Thanks |
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The dent on the primer is being caused by the floating FP at loading, with chances the B/C not fully locking up being the problem at hand. From the start, load a single round into the mag, charge the round from the mag into the rifle while leaving the empty mag in the rig, then fire for effect. Bottom line is if the rifle is stroking correctly, the bolt will lock back on the catch, and until we know that the rifle is stroking correctly, any other advice would be in vain. Also a heads up, You did detail clean the rifle before firing the unit, including using chamber brush in the bore, followed by correctly lubing the upper bearing surfaces of the rig before such. If you just pulled the rifle out of the box, and maybe just ram a dry patch down the bore and threw a few drops of oil on the unit, you didn't clean/lube the rifle correctly. |
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Went down to the farm today and tried the rifle again - same issue!! ?? Per Eric - I checked the hammer spring and it's installed correctly. Per Dano523 - I checked and had proper cleaned and oiled the rifle. I ran the drill he suggested. The rifle fired and ejected the empty and the bolt held open fine. Again the issue is that the first round fires, extracts and ejects fine and the second round is chambered fine it just won't fire. It's 100% of the time. Any other suggestions? |
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Do another check please: With an UNLOADED rifle and magazine removed cock the rifle via the charging handle. Now pull and HOLD the trigger, the hammer should fall normally (you'll hear it) While still holding the trigger back, cock the rifle again with the charging handle. Release the trigger then pull the trigger. Does the hammer fall? If it doesn't you have a disconnector issue.. improperly installed or missing disconnector spring (large diameter side goes down) or a hammer'/disconnector fitting problem. |
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Fire first round, then hit the forward assist a few times to confirm that the B/C is locked fully home before trying to fire the rifle again. If this solves the problem, then either the buffer is not doing is job (acting like a dead blow hammer on bolt lock up) and/or the gas tube end is not aligned to the key/the buffer spring end of coil wind is scrapping the inside of the buffer tube, and when the carrier does bounce back of off the barrel extension after lock up, it will not fully reset home on it's own. The fact that you are getting a click on trigger pull tells me that the hammer is back at cock (not a disco problem), with the FP being blocked by the back of the carrier, and not reaching the primer on hammer fall/contact. |
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