My friends and i once put a 11.1 V lipo in a walmart m4. It was one of the kids that plays with us when he can, it was all he could afford. The thing was crazy fast and surprisingly with the plastic gears it didnt break. Though come to think of it i havent seen that gun in a long time. I think your best bet would be to run lipo if you want a cheep mod that will make your rof pretty crazy fast. I dont know how long the gun will last though, But i know it should last at least a day of use with a happy trigger finger.
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