Rookie Custom feature their custom Hi-Capa 5.1 gas blowback pistol, showing its rainbow silver colour scheme and the specific custom parts used in its construction. The build includes components such as a GSB W-Cat Tracing slide, Rookie guide rod and buffer rubber, TTI hop-up chamber, PDI inner barrel, Quantum hop-up rubber, CowCow piston and piston head, CTM recoil spring, Battleaxe 4.3 frame, CowCow T2 straight trigger, CowCow safety, AM STI beavertail, Nine Ball hammer, CowCow slide stop, and a 5KU Infinity grip.