Adjustable GB ?

Old Corps 8541

Sergeant of the Hide
Full Member
Minuteman
Nov 6, 2022
329
122
Milton FL
Thinking about re barreling a PSA "side charger" into something with a little more "leg" than the 223. I'm thinking of a AGB turned off, basically turning it into a single shot , but with the option going back to a normal self loading AR.
Suggestions on an AGB that won't leak when turned to zero .
Thank you