WORKHORSE ® Forged 7075-T6 Lower Receiver   Specifications: Quality Aerospace 7075-T6 Aluminum Alloy  MIL-A-8625F, Type III,  Hard Anodized Flat Black Finish Compatible with TDP/Mil-Standard AR Lower Receiver Parts Broached Magazine Well   Pictograph Selector Markings Properly Marked for 90° Safety or Short Throw Safety Selectors Multi-Caliber Marking for Build Versatility Easy Install Set Screw Bolt Catch Pin (Pin Included) Captured Takedown Pin Detent Spring (Set Screw Included) 4-40 Upper/Lower Receiver Tension Screw (Screw included) Weight: 8.22 oz Made in the USA FEDERAL FIREARMS LICENSE REQUIRED