This Complete Lower Includes a Lower Receiver Magpul Lower Parts Kit Buffer Tube & Magpul Buttstock Assembly. The AR-15 Stripped Lower Receiver is American made with superior quality for less! Our lower Receivers are CNC machined from a high-strength 7075 T6 aluminum forging for reliable performance and outstanding durability. Machined to Military Specifications & Standards and marked Multi-Cal to be used with multiple calibers on the AR-15 platform. This Lower Receiver comes in type III black hard anodize with an Open Trigger. Pair this with one of our Upper Receivers for a solid fit for your AR-15 build! – Receiver Finish: Type 3 Hard Anodized Black – Lower Receiver Material: Forged 7075 T6 Aluminum – Trigger Guard: Open Trigger – Lower Parts Kit: Standard Parts Kit Included – Pistol Grip: Magpul MOE – Buffer Tube: 6 Position Buffer Tube Butt Stock: Magpul – Compatibility: All AR15 Platform Calibers – Weight: 3.250000 – RF-85 Treated: Non-treated – Unit of Measure: EA