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Matrix M140 260% Irregular Pitch Airsoft AEG Upgrade Spring (450~550 FPS)

2 Customer Reviews

by Chace D. on 03/29/2015
"this is a great spring got it in my kwa m16 no other internal upgrades besides this spring
m16 before matrix 140 spring 310-340fps .30g bbs
m16 after matrix 140 spring 409-420fps .30g bbs
i was able to get 515ps on .25g
by Brett T. on 11/12/2014
"Be prepared to purchase a VERY high-torque motor and at LEAST a 10.8V battery to pull this thing. No less. Avoid a high-speed motor.

So far the spring quality is disgustingly good. Currently in my Version 3 gearbox on my JG G36(DMR version).

Working DAMN good so far! Recommended to those if you wanting to push those fps limits and get some serious distance!