Calibers: 45 Auto, 5.7x28mm. Capacity: 13 (.45 ACP), 20 (5.7x28mm) pistol magazines. Barrel: 16.25" threaded. Sights Adjustable Ruger Rapid Deploy. Length: 30.6" Weight: 7.1 lbs. Stock: Synthetic. Features: Barrel threaded .578"-28. Adjustable length of pull from 12.6"-14.6". The unique bolt-over-barrel design with the magazine in the grip allows for excellent balance and control. The folding stock is reversible and features an adjustable length of pull but can easily be replaced with AR-pattern stocks. The rear of the receiver has a Picatinny rail for maximum accessory compatibility. Interchangeable magazine wells for use with standard Ruger and Glock magazines.