With the unfortunate news of Anderson Manufacuring closing its doors, we will not be able to warranty or exchange any items directly through them. These items are not returnable. Anderson AM-15 Stripped Lower ReceiverFEATURES: Mil Spec, .223 Rem Engraved, Semi-AutoMATERIAL: 7075 T6 Aluminum ForgingFINISH: Type 3 Hard Anodized, BlackCOMPATIBILITY: All AR15 CalibersTREATMENT: Non RF85ADDITIONAL NOTES: Accepts 3/4a ^2 and 1a ^2 Grip ScrewsThe AM-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 ".223 Rem" to be used with multiple calibers on the AR-15 platform. This Lower Receiver comes in type III black hard anodize, and an Open Trigger.