The San Tan Tactical AR-15 Everything but the Lower Kit is the ultimate AR-15 rifle parts kit for builders who want to create a custom AR-15 with factory-level precision and performance. Designed for shooters who take pride in their builds, this kit includes everything you need except the lower receiver giving you full control, flexibility, and cost savings. FeaturesSTT Pillar Billet Upper ReceiverSTT Wedgelock Rail STT AR15 Barrel 5.56 NATOSTT Nitride Gas Tube STT Gas BlockSTT Enhanced Bolt Carrier Group (5.56 NATO)SBA3 Pistol braceMAGPUL MOE GripAR15 Standard Buffer Tube Kit Carbine Mil Spec 6-PositionMil Spec AR15 Charging HandleAR15/AR10 Lower Parts Kit - Without Trigger Note: lower receiver, flash hider/muzzle brake, and trigger not included.