The Adams Arms Mid-Length Base Complete AR-15 Upper Assembly has everything you need in a piston upper assembly. This upper receiver can be connected to any standard AR-15 lower receiver.
Piston systems increase overall reliability while also decreasing the amount of maintenance required to keep the AR-15 operational. The short stroke gas piston operating system is designed to run cooler and cleaner than a standard direct impingement system. The piston system parts and the barrel have been treated with a salt nitride meloniting process making them harder and more corrosive resistant than hard chrome.
The mid-length piston system will also give you the benefits of a longer forearm by giving the user a longer, more ergonomic grip, a longer sight radius between the front and the rear sight for quicker sight acquisition and less felt recoil. This Adams Arms AR-15 upper incorporates M4-style handguards.
Features and Specifications:
Adams Arms Mid-Length AR-15 Complete Upper Assembly
Material: 4150 Chrome Moly Vanadium Steel With QPQ Melonite/Nitride Finish
Caliber: 5.56mm NATO/.223 Remington
Barrel: 16", Government Profile
Rifling: 1:7" Twist
Muzzle: 1/2" x 28 Threaded
Muzzle Device: A2 Flash Hider
Handguard: 2-Piece Polymer Construction, Mid-Length
Gas System: Mid-Length Short Stroke Piston System
Gas Block: Single Rail, .750"Dia
Upper Receiver: A4 Flat-Top, Forged
Bolt Carrier: 1-Piece Integral Piston Strike Face
Feed Ramps: M4
Weight: 4.387 lbs