X-15, AR15 Gen2 Stripped Lower Receiver
Mil-spec dimensions
Matte hard-coat Anodized Black
7075-T6 forged aluminum
Designated "Cal Multi"
Rear takedown pin detent hole is threaded for a 4-40 set screw
Upper tension screw, fine tune fit  upper/lower
Increased magwell flare
Works with standard AR15 components and magazines
MFG# APAR501101