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. Don't over pay for a lower receiver! Use the money you save elsewhere on your build! Pair this with one of our Upper Receivers for a solid fit for your AM-15 build!Comes with Pistol Grip Installed. Technical Specifications Lower Receiver Material Forged 7075 T6 Aluminum Lower Receiver Finish Type 3 Hard Anodized - Black Trigger Guard Open Trigger Lower Parts Kit Standard Parts Kit Included Pistol Grip Magpul -Black Buffer Tube Pistol Buffer Tube Kit Buttstock Included Compatibility All AR15 Platform Calibers Weight 2.10 Country of Mfg United States RF-85 Treated Non-treated UPC 640901512372