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If you use a carbine barrel(16"), then the gas port is approx 8.25". so no reason to re-locate it for a 10.5". Maybe enlarge it some.
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Jerry W.
NRA Instructor: Pistol, Home Safety, Personal Protection, RSO, Reloading.
NRA Life Member, NRA-ILA Sustaining Member, AZ CCW training org. & instructor, AZ HE instructor.
JWsGUNs.com FFL-07, NFA SOT-C2.
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