Laylax got some of the best parts for upgrading the Tokyo Marui Hi-Capa 5.1 gas blowback products and other compatible brands. In this video they list the top for giving the Hi-Capa 5.1 an aggressive look.... "Introducing 5 recommended Laylax parts that can be incorporated into the Tokyo Marui gas blowback gun Hi-Capa 5.1 Government Model.
Increasing the muzzle velocity, stabilizing the trajectory, and improving the reload speed of an air gun can be a big advantage in itself.