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Posted: 10/5/2014 3:19:35 PM EDT
Finally got around to going to the range with the new 10.5 pistol build. Got FTF on 3 different types of ammo and mags. 
Suggestions? Heavier buffer or compensator or both? |
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Quoted: I would get a fail to feed after first round would eject but would not cycle the next one. I used a carbine buffer and I only have a a2 flash hider on it. |
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Quoted:
Eh, almost everyone agrees that a 10.5" bbl needs at least an H buffer if not an H2. Even if the gas port is the perfect size for the ammo you're using there's still dwell time to consider and a heavier buffer helps to compensate for the shorter dwell time with the 10.5" bbl. Quoted:
Quoted:
I would get a fail to feed after first round would eject but would not cycle the next one. I used a carbine buffer and I only have a a2 flash hider on it. If gun is short stoking, a heavier buffer will only compound the problem. It's best to fix the problem before worrying about optimizing. - OS |
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Quoted: If gun is short stoking, a heavier buffer will only compound the problem. It's best to fix the problem before worrying about optimizing. - OS |
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OP, read through this thread for possible solutions to your problem. |
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OP.......what parts are you running? Barrel? Ammo? Buffer? Spring? Unless pyu are just venting, more info is needed to help you with this FFT issue. Sorry, had to take off for a b-day party yesterday. So the parts are : Barrel is a 1:7 heavy barrel/upper from Harden Arms. BCG is AIM NiB Buffer and buffer spring is I am assuming CMMG. I bought it along with the sb15 buffer type tube from ebay. I believe it should be a carbine buffer etc. The ammo that was fired starting with my first failure to feed was cheapo wolf steel cased 55 grain, the second time was remington 62 grain , and the last where it wasn't a failure to feed but it was a failure to reset the trigger. No indent on case from pin hit or anything and that was with federal reloads 55 grain. The gun is set up with only a a2 flash hider also. The LPK came from PSA not the PTAC cheapo stuff and it was installed by a gunsmith. |
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Very helpful .. Thanks. It seems I may have a couple of issues going on. One being the trigger failing to reset and the failure to feed issue. |
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Quoted:
Very helpful .. Thanks. It seems I may have a couple of issues going on. One being the trigger failing to reset and the failure to feed issue. Quoted:
Very helpful .. Thanks. It seems I may have a couple of issues going on. One being the trigger failing to reset and the failure to feed issue. Again, quickest test, if it doesn't lock back on empty mag, short stroking due to undergassing is almost certain, as would account for both not feeding next round and not resetting trigger. - OS |
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Quoted:
Again, quickest test, if it doesn't lock back on empty mag, short stroking due to undergassing is almost certain, as would account for both not feeding next round and not resetting trigger. - OS Quoted:
Quoted:
Very helpful .. Thanks. It seems I may have a couple of issues going on. One being the trigger failing to reset and the failure to feed issue. Again, quickest test, if it doesn't lock back on empty mag, short stroking due to undergassing is almost certain, as would account for both not feeding next round and not resetting trigger. - OS Thanks. It will be until next weekend before I can check. I didn't try that when I was out there. |
| I had the same issue on my first build. I took it out to the range today and similar deal it cycled ok but the bolt would not lock to the rear with an empty mag. upon investigation with my carbine length. I used a longer length spring by about 2" same buffer but with the longer spring it just wouldn't lock the bolt. I cut off 2" of the spring and it seems to work now manually Ill be checking it out this weekend at the range. maybe this helps.. Good luck and please let us know the fix. |
| It sounds under gassed or other gas related problem. Check you gas rings to make sure they slot is not lined up in a row. as well. I would then make sure the all of you lower parts are installed correctly. After that check the barrel gas port, and make sure the gas tube is not clogged for some reason, and that the gas block is lined up over the gas port. |
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Check to see if your gas block is up against the barrel land. If it is the gas ports may not be aligned.
Some gas blocks are designed to have the handguard plate installed in between and adjust the ports for it. If you can, move the block out a little (I don't know the measurement - just the thickness of the plate) and try it. YMMV |
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