Pin & Weld Muzzle Device Service OSA Pin & Weld Muzzle Device Service Need to make your 13.7", 13.9", or 14.5" AR-15 barrel compliant with the federal 16" minimum rifle barrel length? Our Pin & Weld Service permanently attaches your muzzle device to the barrel using ATF-accepted... MSRP: Was: Now: $75.00 Add to Cart
