Kevin tests a custom MK47 Mutant gas blowback rifle that uses the Tokyo Marui MWS GBB as the base gun. It is a PLA 3D printed design MK47 AR15 pattern lower receiver + side charging upper prototype. The inspiration for this custom project is the CMMG Mk47 Mutant is a reliable American-made carbine chambered in 7.62x39mm and manufactured by CMMG Inc. Compatible with all AK magazines, including steel, polymer and drums, this carbine offers exceptional reliability and classic AR ergonomics.

Kevin DB showcases his one-of-a-kind Custom MK47 Mutant Gas Blowback Rifle. Built on a Tokyo Marui M4 MWS GBB platform, this airsoft gun features a PLA 3D printed upper receiver and bolt carrier, paired with a TM MWS trigger box, custom hammer, and sear. The recoil is enhanced with a 232g steel buffer and a 140% buffer spring. The video concludes with a demonstration of the rifle's semi and full auto capabilities.