The 16 GII AP4 is everything you would expect from an improvement to the award winning LRAP4, which was the second MSR to win an NRA Golden Bullseye Award. Which MSR was the first you ask? None other than the DPMS 24 LR308. Lightweight 16 barrel, AP4 Stock, DPMS carbine length Glacier Guard and MagPul Gen 2 rear sight. Stock : AP4 Muzzle : Cancellation Brake Receiver Material : Forged 7075-T6 Aluminum Sights : Front F-Marked Sight Based, Rear Magpul BUIS Barrel Description : 4150 Chrome Lined Twist : 1:10"