(SOLD OUT) AAC MPW 300 BLACKOUT AR15 PISTOL. These are some of the nicest AR15 pistols made. The fit on the upper and lower is one of the best and tightest fits I have ever seen in an AR15. It has the Knight's Armament hand guard, and the AAC brake so your AAC suppressor screws rite on. It has a custom AAC bolt carrier standard with each gun.