I built a custom rifle and I finally got out to shoot it. Here's the build thread:
https://www.m4carbine.net/showthread.php?t=175348
I was having issues with the bolt locking back after the last round and failure to feed. I swapped with 3 different BCG's, three mags, and two different lowers. All had the same results with the upper. I tried all the same tactics with a different upper to verify that all parts functioned correctly.
Would I be correct to assume that the gas block is the culprit?
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