Posted: 2/13/2024 1:49:48 PM EDT
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Checking to see if you guys do any "tuning" of firearms. I have an upper that operates as if it's under-gassed (won't hold back bolt on last round; won't feed rounds after first shot). I believe it may be because it wasn't assembled properly (you guys did NOT do this build). It's a Colt A2 upper with a Colt M4CQB 10.3" barrel. https://www.ar15.com/forums/armory/Need-Help-with-SBR-Build-Non-Functional/51-549961/ |
Tom Sawyer.
