• Lower receiver is fitted with an adjustable SB Tactical® SBA3® Pistol Stabilizing Brace® to aid in accuracy, balance and recoil management.

• Handguard is free-floating for accuracy and the slim, 9" length provides enhanced ergonomics and support. Magpul® M-LOK® accessory attachment slots along the 3:00, 6:00 and 9:00 positions.

• Made from aerospace-grade 7075-T6 aluminum forging, the flattop upper receiver includes a forward assist, dust cover and brass deflector.

• Bolt is machined from 9310 alloy steel and is shot peened and pressure (proof) tested to ensure strength, structural integrity and durability.

• Carbine-length gas system ensures reliable function with a wide variety of ammunition. Models 8571 and 8572 feature a pistol-length gas system.

• Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise rifling provides exceptional accuracy, longevity and easy cleaning. M4 feed ramps provide improved reliability, and the matte black oxide finish reduces glare and provides corrosion resistance.

• Bolt carrier and gas key have chrome-plated inside diameters to provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing. A matte black oxide finish on the exterior of the bolt carrier provides corrosion resistance.

• A Ruger® flash suppressor is provided, and the 1/2"-28 threaded barrel allows for standard muzzle accessories to be installed.

• Also includes: One magazine.

Features listed above are available on all standard models, but may not appear on Distributor Exclusive models. See individual spec sheets for model specific features.