<p>ArmaLite Inc. proudly introduces the new AR-31. The AR-31 shares the design and the accuracy of our highly acclaimed AR-30A1 bolt-action rifles, but with three MAJOR differences: the AR-31 is chambered in .308 Winchester, it is a short action version of the AR-30A1, and it accepts Armalite’s AR-10B double-stack magazines. That means you can use 5, 10, 15, 20 and 25 round mags with the AR-31. For sub-MOA accuracy, think ArmaLite’s AR31! Caliber: .308 Winchester ” Double Lapped, Chrome Moly Rifling Twist: 1:10 Muzzle Device: Muzzle Brake Trigger: Single Stage Stock: Adjustable Cheek Piece (Height) & Buttstock (Length) Overall Length: 35.5″ – 39.6″ Weight: 12.5 LBS *Bipod, scope, and scope sount not included</p>