From the onset, Windham Weaponry has had one goal: to build the finest AR type rifles in the country. All of their rifles are built with 4150 chrome-moly vanadium steel barrels, which are chrome-lined for long wear and ease of maintenance, and 7075 T6 aircraft aluminum receivers with a durable black hard coat anodize finish. The CDI utilizes a gas-impingement system that's housed in an M4-A4 flattop upper receiver full-length picatinny mounting rail. The forend is a Diamondhead free-float model with a Magpul AFG angled grip for off-hand comfort and recoil-reduction. The rifle's bolt is made of Carpenter 158 Steel and its 16" M4 profile barrel has an A2 flash suppressor and a 1 in 9" right-hand twist. The Magpul MOE pistol grip has a built-in storage compartment. Diamondhead back-up sights are included for added tactical precision Each rifle ships with a hard plastic carrying case, a web sling, and one 30-round magazine and carries a lifetime warranty.