Lees Precision Engineering Laser Cut Shims are designed to be placed under the magazine top rubber in an airsoft GBB magazine, increasing efficiency and velocity in the gas pistol.
The laser cut magazine shims are placed under the magazine rubber seal, and create a better seal between the rubber and the blowback chamber. This results in both better efficiency and higher velocity. Combining easy installation and low cost, these are one of the best upgrades for any gas blowback pistol.
This model will fit the following Tokyo Marui pistols:
TM PX4 Storm
TM MK23 SOCOM
It will also fit WE Hicapa and WE 1911 models.