1.3 GLD UN-EVEN Special SPRING (EASIER ON YOUR MOTOR)
M4A1/SCARv2/UMP45/MP5V2/GEN9,10/HK416/V2.0 GEARBOX + many more
1.3mm GLD UN-EVEN UPGRADE SPRING
MORE FPS (BEST USE METAL GEARS)
We have done all the hard work and spent a lot of money in research for you and these parts that I am now selling are the best and will be the right type of upgrade that will give you the best benefits. These parts are limited so first in first served.
150mm (L) X 14mm (W)