Radial Delayed Blowback™ Operating SystemOriginally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart. Mk4 ZEROED parts and accessories – Quality comes standardThe AR15 platform is well known for its capability for customization but picking the right parts doesn’t have to be a nightmare of homework. Everything from the RIPBRACE to the full kit of ZEROED parts and accessories are made here in the USA with quality and attention to detail that is second to none and each BANSHEE comes equipped with a slew of ZEROED parts standard, including:ZEROED Pistol GripZEROED Drop-In Trigger ZEROED Trigger GuardZEROED 60°/90° Ambi SafetyZEROED AR15 Ambi Charging HandleZEROED Ambi Mag CatchZEROED Extended Mag Release ButtonZEROED AR15 Bolt CatchZEROED AR15 Polymer Dust CoverZEROED Linear Compensator 9mm