JM GEN 8 M4A1 HQ 1.2mm UPGRADE SPRING UN-EQUAL
1.2mm is the sweet spot for distance and accuracy this spring will put less stress on your motor
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.
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# Beast JM GEN 8 M4A1 1.2mm UPGRADE SPRING UN-EQUAL