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For: SRC Complete 8mm M4 Gearbox (~400FPS)Product Information:
I was looking for something to replace my TM gearbox and i hit this and thought it was perfect. So i bought it and it is very nice. It is all reinforced and i am pretty sure it can handle a 11.1v. When i received it i saw that it came with an upgrade spring that makes it shoot 400 fps. I don't recommend putting this in because it will cause more tension in the gearbox and it will not have as fast as a ROF. I was very impressed with the ROF it has with a 9.6, the trigger response is really nice and smooth. Highly suggest!
Cant beat the price
A little annoying to install but its all worth it