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