M4A1/SCARv2/UMP45/MP5V2/hk416d
JM GEN 8 HQ 1.2mm UPGRADE SPRING
1.2mm is the sweet spot for distance and accuracy
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.
YOU ARE BUYING:
# Beast JM GEN 8 M4A1 1.2mm UPGRADE SPRING.