Type:  AR-9 Lower Receiver — milled from 7075 T6 aircraft grade aluminum billets
Caliber:  Multi
Magazine:  Accepts any Glock style small frame pistol caliber magazines in 9mm, .40 S&W, .357 SIG,  
Weight:  12.1oz before anodizing 
Machined from 7075-T6 aircraft grade billet aluminum
Precision machined magazine well with beveled feed lip for easy mag swaps
Compatible with most standard AR-15 components and most aftermarket parts
Take down pin spring and detent hole is threaded for a set screw for easy capturing (hardware included)
Upper tension screw 
Threaded bolt catch pin (Threaded hole and hardware)
Integrated trigger guard
Proprietary magazine catch assembly machined in house from 6061-T6 Aluminum