The Troy Industries SPC M4A3 AR-15 Pistol comes with all the reliability that you expect from a company like Troy Industries. This 10.5” AR-15 chambered in 5.56 NATO is the most versatile in the lineup and features a carbine length gas system, receiver extension, and the Troy SOCC M-LOK BattleRail. The Troy SPC A3 pistol receivers are fully assembled with Mil-Spec parts that are reliable and keep the total cost down. Included is an A2 pistol grip and flash hider to reduce the muzzle flash. If you are looking for a reliable and well built AR-15 carbine, you can't go wrong with the Troy Industries SPC M4A3.