The Stag 15 Classic Rifle is the high quality durable military proven M4 design rifle you've been looking for. Made to mil-spec standards this rifle satisfies the need for a standard GI carbine. The Stag 15 M4 features a 5.56x45mm NATO chamber 16" 1/7 nitride barrel with our slimline free-float handguard a mil-spec trigger guard a six position buttstock A2 birdcage flash hider and a mil-spec nitride M16 BCG. Every complete AR15 rifle from Stag Arms comes with a Transferable Lifetime Warranty an Infinite Shot Barrel Guarantee and a magazine.