The 16″ 5.56 NATO M4 barrel is the perfect barrel to start your next build and add to your AM-15 collection. This barrel is made from 4150 Chrome Moly Vanadium Steel with a Parkerized finish. Featuring a carbine length gas system with a .750″ gas port and a 1:8 twist. Comes with an A2 Front Sight Base With Sling Swivel, A2 M4 Notched Hand Guard Cap, & A2 Barrel Nut. This barrel provides top accuracy and precision for your 5.56 build.