9mm Luger caliber; The most adaptable 9mm PCC you'll ever find; Built with Cmmg's standard AR15/Mk4 lower receiver; Aircraft grade aluminum receivers; Radial Delayed Blowback Compact Action; Non-reciprocating side charger; M-Lok free float handguard; The rear of this Dissent rifle features the side folding stock with adjustable length of pull and adjustable cheek riser; Mk4 Zeroed parts and accessories - Quality comes standard; Cerakote finish standard; Cmmg's Lifetime Quality Guarantee