THIS RIFLE HAS A PINNED & WELDED SUPPRESSOR, ALL NFA RULES APPLY. (All Sales Are Final On NFA Items, No Returns) Rifle: – 5.56NATO (.223 ) -11.5″ Barrel with a 1:7 Twist Rate – 29.5-32.5″ Length – 7075-T6 Aluminum Upper & Lower Receiver  -Type III Hard Coat Anodizing – Salt Bath Nitride Barrel – BFI™ 10″ Free Float Rail – Salt Bath Nitride Bolt Carrier Group – MPI Tested Bolt MUTA BM556: – Legnth: 6.0″ – Weight: 16.9 ounces – 17-4 H1150 stainless steel – Finished with high temp cerakote – Full-auto rated – Removeable end cap  – Thread: ½”-28 – Diameter: 1.5″