If 10mm is the best millimeter for you, stop your search here. With an 8" barrel this Mk10 BANSHEE is built to extract the full ballistic performance expected of the 10mm cartridge. Glock-pattern magazines have come to be known for their reliability and affordability, and if you already have your own collection of 10mm Glock-pattern magazines going then they will be right at home with the Mk10. Originally developed for the .45 ACP MkG platform, CMMG has adapted their Radial Delayed Blowback system across the pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems.