This ULTIMATE® Upgrade Series Version 2 gearbox shell is cast in high-strength materials to ensure the box can handle the stresses that upgrades will exert on the box

Lift rear hinged half and slide the front shoe into the M-LOK® slot

1 "2 Way Fixed" Non-Recoiling Outer Barrel

Acetech's newest innovation is the 11 different multi-color flame function that looks incredible when firing a barrage of BBs down range

efficient and flexible design

COWCOW Competition Recoil Buffer Cytac This ULTIMATE® Upgrade Series VersionHigh quality anti oil rubber material 4 different hardness (45Yellow 55Red 65Blue 75Black) in a package Serves with stainless steel spacers Well performance on shock adsorption Become a cushion to protect the slide against the frame Different combination to optimise the recoil for professional player