Roger that.
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Difference between Crane’s cut down 10.3" Govt profile and FN’s new 10.3" SOCOM bbls. Gas port is a measured .070"
The parts: FN bbl, upper, BC and bolt, DD RIS II Mk18, PRI CH, SF4P FH and KAC front sight. Rest of parts are all govt contracted. Only thing that’s used was the Forward Assist, almost selected a teardrop M16.
Assembled and installed on select fire lower w/SSF trigger. Second we built this week with FN bbl. Bit heavier up front of course.
CD
Thanks, CD–not just for what you’ve done in prior service and what you now do, but also for sharing this “look behind the curtain” with us. 
CD,
Thank you for posting all the info along with the pictures.
A few years back, I got to spend a little time on the range with a CQBR, during our weapons quals. (We were fortunate to have the Group guys at our base run our qualifications and training). That experience drove my desire to get SBR’s when I got home, and has cost me a considerable amount of money. Although, I probably won’t ever go the clone route.
And yeah, I needed a hair cut.