The MK116 Pro features a Piston Driven upper, 15″ M-Lok handgaurd, BCM Stock, & many other specs that make it a top tier rifle
Primary Weapons 19PM116RA1B MK116 Pro 223 Wylde 16.10″ 30+1 Black Anodized Rec Black Adjustable BCM Stock Black Polymer Grip Right Hand (Piston Driven)