Latest offering from Adams Arms has the pinned railed gas block piston system. The 5.56 Midlength Tactical Evo 14.5" Upper is a short barreled upper that incorporates the patented Adams Arms technology and the Samson Evolution free floating forearm. The midlength piston system will 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. The piston system parts and the barrel have been treated with our salt nitride Meloniting process making them harder and more corrosive resistant than hard chrome. The free floating forearm was manufactured for us by Samson Manufacturing and is a 10" tube that extends around the gas block, giving you enough space to mount the removeable picatinny rail pieces to meet any of your needs.
Upper Receiver: A4 Flat-Top, Forged
Barrel Length: 14.5"
Barrel Contour: Government
Barrel Material: 4150 Chrome Moly Vanadium Steel
Muzzle Thread Pattern: 1/2"-28
Chrome Lined: No
Barrel Finish: QPQ Melonite / Black Nitride
Twist Rate: 1 in 7"
Chamber: 5.56x45mm NATO
M4 Feed Ramps: Yes
Bolt Carrier: 1-Piece w/Integral Piston Strike Face
Muzzle Device: A2 Flash Hider
Gas System Length: Mid, Short Stroke Piston Operated
Gas Block Diameter: 0.750" Railed Gas Block
Handguard: Evolution Rail
Build as a pistol or SBR with tax stamp in states where legal.