Description Reviews The Smith & Wesson M&P-15 Stripped Lower is an aluminum, mil-spec lower receiver for AR-15 style firearms. It features forged 6061-T6 aluminum construction, black hard coat anodized finish, and accepts standard upper receivers and standard AR lower parts kits. FEDERAL FIREARM LICENSE REQUIRED FOR PURCHASE: Yes RECEIVER FINISH: Type 3 Hard Anodized, Black LOWER RECEIVER MATERIAL: Forged 7075 T6 Aluminum TRIGGER GUARD: Open Trigger COMPATIBILITY: All AR-15 Platform Calibers WEIGHT: 0.680000 COUNTRY OF MANUFACTURE: United States RF-85 TREATED: Non-treated UNIT OF MEASURE: EA WARNING: Must be 21 or older to purchase. If you live in California, please read your local laws before ordering. Highest Quality, Fastest Shipping.