Are you sure this is really a unmodified brand new Ares G36CV? Did you buy it in a store, or by a "friend"?
All out-of-the-box Ares G36 guns I've seen (and S&T/Umarex clones) use clear plastic pistons and piston heads, plain grey shrinkwraped motors with soldered contacs, and typical white Tamiya connectors, not those yellow ones. Also, the gears look mismatched, each one from a different origin.
Ares does have QC issues, but this looks like a bad tech job made with second hand parts taken from ACM guns...
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