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.