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Joined:
Sep 2026
Posts:
21
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WI, USA
Posted: Yesterday 1:00:37 PM EDT
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Long story short. I bought a Lantac dual charging upper receiver for a 300 blackout build. Lantac’s side charging bcg was outta stock. I substituted the bcg with an Alexandria profab side ch bcg. This is a 8.5 build with a Superlative adjustable gas block, binary trigger etc. I’ve only taken this build out a few times, with kind of lack luster results. Short stroking, not picking up the next round, not locking back, etc. Yesterday, I upgraded to an Atrius frs, and from an H2 to an H3 buffer. Results were a single shot, and not picking up the next round(short stroking) I was convinced that somehow my adjustable gas block was the culprit. But I decided to inspect the bcg, and change the bolt before I bought something I do not need. Anyway this bolt seemed to me to be far too easy to manipulate. I mean you can set it on its nose, and it doesn’t depress, but it just seemed off. So, I installed a spare BCM bolt, and baam! It was like a completely different machine, that actually runs, locks back etc. Has anyone ever run into something like this? Should I contact Alexandria profab about this? Or should I just swap out the gas rings, and test to see if this bolt is outta spec? I have no idea how this company is with QC, or CS. What would you do? |
Joined:
Sep 2026
Posts:
22
EE: 0% (0)
WI, USA
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Originally Posted By jaqufrost: I would swap the gas rings. Looking at this bcg more closely, There is carbon building up at the rear base of the gas key. I don’t think thats a good sign. None of my other bcg have this buildup. I’m guessing they didn't use any form a gasket on the key install. It looks like it’s staked correctly, and it doesn’t seem loose, but there is buildup. I have a Brownell's gas key staking tool, so I guess I’ll order a gas key. |
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