Quick view Add to Wishlist ZAVIAR Firearms 9mm 16" Nitride M4 Contour Barrel / 1:10 Twist / Blow Back Platform: AR-9 Weight: 1 pounds Length: 16 inches Profile: M4 Contour Twist Rate: 1:10 Finish: Nitride Material: 4150 Chrome Moly... MSRP: $139.99 $109.99 Choose Options Compare