The ATI Tactical Omni Maxx Hybrid AR-15 Pistol 5.56/223 7.5" has a polymer upper/lower hybrid, aluminum 7" M-LOK rail, polymer lower receiver, polymer upper receiver and is optics-ready. Extremely reliable while still being light, tough, and highly maneuverable. Accepts all standard AR-15 accessories. These pistol have polymer lower parts kits manufactured by Plum Crazy. Ships complete with one 30 round magazine and SB Tactical SBM4 pistol arm stabillizing brace.. SPECIFICATIONS: UPC:  819644021735 Description:  ATA OMNI MAXX HYB P4 5.56 7.5B Brand:  American Tactical Imports Model:  Omni Hybrid MAXX P4 M-LOK Pistol Type:  Pistol: Semi-Auto Caliber:  5.56 NATO|223 Finish:  Black Action:  Semi-Automatic Stock:  SB Tactical SBM4 pistol arm stabillizing brace Sight:  No Sights Barrel Length:  7.5 Black Phosphate Coated Barrel , 1-7 Twist  Overall Length:  23 Weight:  4.7875 lbs Capacity:  30+1 # of Mags:  1 Safety:  Manual Safety Receiver:  Steel Reinforced Polymer Upper And Lower Features:  Beveled Mag Well HGA NANO Composite Parts Kit SB Tactical SBM4 pistol arm stabillizing brace