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Joined:
Jan 2023
Posts:
47
EE: 100% (1)
TX, USA
Posted: 7/9/2026 12:16:29 PM EDT
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Hello all I have a 11.5” SBR in 5.56 and would like to build an upper for it in 300 blackout, also 11.5”. Is this ok or does it require another SBR doe to different caliber? |
Joined:
Jan 2023
Posts:
48
EE: 100% (1)
TX, USA
AR Sponsor