Assembled an 11.5” upper

Colt upper
Colt BCG
Colt 11.5” HRT/SOCOM barrel
BCM MCMR 10”

I was originally going to cut down a spare gov profile colt barrel I had but came into to the factory 11.5 with pinned GB for a good price. Downside is the factory 11.5s have a gas port around .073ish, but I had an extra BRT .060 port from an old project.

Tapped the GB for 8x32 and threaded the port in, no issues.




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