JP FMOS Full Mass M16 Bolt Carrier Black QPQ Finish, AR-15, M16 Select-Fire Compatible

JP FMOS™ Bolt Carrier Small-Frame (.223) M16 Select-Fire Stainless Steel QPQ Black Finish Not for use in AR-10-type rifles Weight: 8.75 oz with key installed All NFA Rules Apply Warning Be aware that it is inadvisable to use any full auto components in an AR-15 semi-auto rifle. If you happen to have an unexplained "double" (more than one round firing with one press of the trigger), you could be prosecuted for manufacturing and possessing an illegal weapon.