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Matrix M125 210% Irregular Pitch Airsoft AEG Upgrade Spring (400~470 FPS)
by Ryan G. Date Added: January 17, 2013
Just added this to my CYMA CM028U AK to bump it up a little for outdoors. Spring was a beast to put in compared to the stock spring. And I had to upgrade to the 9.6V battery as stated. The stock battery wouldn't even turn it over! Other wise I have been out a few times with it, full auto and semi without any other issues. Stock motor and all other stock parts + internals.
I don't think I would go any higher though without another motor. This seems to be a good size to get a bit more bang out of your gun without breaking everything.

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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