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Posted: 10/21/2019 5:59:59 PM EDT
[#1]
That's about as clear as mud, OP. I've built more ARs than I can remember, but even a fanatic like me doesn't know about all the different brands and parts out there, so I'm having a difficult time figuring out what you're saying.
Am I understanding correctly that after putting a new handguard on your rifle it's now refusing to lock back, regardless of buffer and spring weight? When you changed the handguard, did you also change the gas block? ETA: One way to check gas block alignment, now that you've put some rounds through it, is pull the gas block and look at the ring of carbon around the gas port. That will tell you right away if it's misaligned. In general, though, gas blocks are cut so generous that it would have to be WAY off, like very obviously so, to restrict enough gas to cause problems. |
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Posted: 10/21/2019 6:08:49 PM EDT
[#2]
If I understand, you basically just swapped barrels. Had issues with the bolt locking back. Tried a variety of combos between buffer and spring weights.
My first thought would be gas. As in not enough. I’d check the gas block, tube, and carrier key. Have you tried running a different BCG, lower, etc to at least try to isolate the issue? I had an AR pistol recently with a similar issue. Turned out to be a gas block screw came loose and the GB shifted. |
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Posted: 10/27/2019 1:36:48 PM EDT
[#3]
Since you swapped out to a mid-length barrel, have tried a standard carbine buffer, and standard carbine spring, if so what were the results?
Make sure the gas block is properly aligned and centered over the gas port, in Armorer Courses we teach to use an Alignment/Dimpling Fixture when installing gas blocks as this helps to make sure everything is centered over the gas port. Next make sure the barrel nut is properly aligned so the gas tube isn't rubbing when it mates with the bolt carrier key (gas key). Make sure everything is well lubricated, especially making sure the 7 bolt lugs are good and wet. There is no mention of ammunition used, but what were you using and did you try different brands and types, if so what were the results? When testing, try loading one round in the magazine at a time to see that the bolt carrier travels rearward enough to lock back. CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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Posted: 10/27/2019 1:42:19 PM EDT
[#4]
Something tells me OP found the problem not long after making this thread.
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