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Page AR-15 » Troubleshooting
AR Sponsor: bravocompany
Posted: 6/2/2024 5:04:17 AM EDT
Just finished a build with a 14.5" stainless Ballistic Advantage 5.56 barrel, using a standard Anderson lower, 3oz buffer and carbine spring in a KAK brace/buffer tube, and toolcraft BCG.  I initially test fired with Wolf polymer, and immediately noticed short-stroking....case would eject, but not enough to pick up the next round in the chamber (and certainly not enough to lock back on an empty mag).  Tried several rounds, still the same result.  Moved on to PMC 55gr FMJ, no change.

Normally, I'd conclude that the gas block was out of position, but this is one of the pinned gas blocks with set screws (package deal from Ballistic Advantage).  I know there are a few other things I need to troubleshoot first, but what are the odds the gas block was incorrectly pinned?  It certainly *looks* in correct position...
Link Posted: 6/2/2024 6:23:45 AM EDT
[#1]
Link Posted: 6/2/2024 10:48:02 AM EDT
[#2]
Link Posted: 6/2/2024 10:16:51 PM EDT
[#3]
Run brass ammo, and see if the same problem.
View Quote
It was also checked with PMC, same results.

I'm going to try cleaning the bore/barrel, as well as trying a couple different BCG's and lowers, and see if anything changes.
Link Posted: 6/10/2024 6:26:42 PM EDT
[#4]
Update 6/10

Cleaned the barrel/chamber up a bit, and seemed to make a big difference.  Not quite 100% (yet) with Wolf polymer, cycling fine but not locking back on the last round, but 100% with PMC bronze.  I think with a couple hundred rounds of break in, it will be perfect.  Ejection pattern is around 4 o'clock.
Page AR-15 » Troubleshooting
AR Sponsor: bravocompany
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