POF-USA P415 Edge AR-15 Complete Upper Receiver 5.56x45mm NATO 13.75" Barrel with Pinned Dead Air Muzzle Brake was engineered to be virtually unstoppable in unfavorable conditions. It is a product of continuous development and improvement to the AR platform that no other rifle company has attempted or succeeded at. The reliability has been tested time after time, and the operating system perfected. E2 Extraction Technology, ambidextrous charging handle, modular free floating rail platform, and numerous internal improvements make it the pinnacle of all-purpose 5.56 NATO receivers. The P415 EDGE Upper simply will not fail when you need it most. The Dead Air KeyMo muzzle brake is pinned and welded to make the barrel 16.1" in overall length. Features Chambered in 5.56X45 NATO.13.75" Barrel, Black Nitride Heat Treated, 4150 CrMoV Steel, 1-8 Twist, 5R Right Hand Lands & Grooves, & 1/2X28 Muzzle Threads.Mid-Length Gas System with 5 Position Adjustable Gas Plug.11" EDGE Rail System.Pinned a...