don't bother. Ares gearboxes aren't fantastic.
it would have to be a pretty spacious slide-off upper (or without the charging handle screw), and you'd have to be pretty patient assembling/disassembling it with that integrated hop-up and the barrel sticking out of it.
it also might need some fudging with the lower to accommodate the spring guide assembly.
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too busy tinkering to play.
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