Following the adoption of the Sig Sauer P320 as the M17 and M18 by the US military, shooters have been asking for a pistol caliber carbine that uses P320 mags. Not only can you switch magazines from BANSHEE to handgun seamlessly, you also retain full AR15 functionality in the Mk17. EML handguards, full length M-LOK slots on both sides and the bottom of the handguard as well as M-LOK between the top picatinny rail sections. The Mk17 features Radial Delayed Blowback operating system; full kit of ZEROED parts including: pistol grip, drop-in trigger, 60/90 degree ambi safety, linear compensator 9mm, AR15- ambi charging handle, bolt catch and polymer dust cover. Includes Sig Sauer P320 21rd magazine.