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Gunsmithing .22 AR build upper

NavyshooterM40

CAPT USN (ret)
Full Member
Minuteman
Sep 19, 2010
489
115
Texas
Purchased CMMG .22LR barrel from Midway. Do you use a M4 or Rifle cut upper for .22 builds.
Thanks
 
Doesn't matter which you use. The .22 chamber and feed ramp is well outside where the standard AR barrel extension ends.