Description This lot is for two Standard Manufacturing STD-15 stripped lower receivers, can be chambered in multiple caliber’s such as 5.56x45mm, .223 Remington, .300 Blackout, and more. Both of the lowers are made of 7075T6 forged aluminum with type 3 hard coat black anodized finish. Long trigger pocket and low shelf, can accept a Registered drop in auto sear without milling. Must ship to a FFL holder. Condition: New with some light scratches and handling. Serial: ARS0002556, ARS0002505 Manufacturer: STANDARD MANUFACTURING CO Caliber: 5.56, .223, .300 Blk Model: STD-15 Book# 04438 04439