Description Stag Arms Stag-15 Stripped Lower Receiver, multicaliber for 5.56, .223, and .300 AAC Blackout. Forged aluminum with black anodized finish. Comes in its factory box. Must ship to a FFL holder. Condition: New with one small factory blemish on the bottom right side of the frame. Serial: S063621 Manufacturer: STAG ARMS LLC Caliber: Multi Model: Stag-15 Book# 03262