San tan's stt-15 billet lower features an ambidextrous design for your ar-15m4 platform, which allows it to accommodate any and all shooters without the need to add countless costly add-ons.It is directly from a billet of 7075-t651 aerospace grade american aluminum and holds ultra-tight tolerances.The finished receiver is then finished in mil-spec, mil-a-8625 type iii hard anodizing.The stt-15 is everything you have come to expect from a san tan tactical, and then some.Note: requires a lower parts kit, buffer & stock of your choosing to complete.Type: StrippedGun Model: AR-15Gun Type: AR PlatformCaliber: Multi-CaliberMaterial: 7075 T6 AluminumFinish: Black Anodized