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the toptech gearboxes that have the pneumatic crap on top are also part of the bolt plate assembly on the ARs and mp5s I've worked on, so putting in a standard v2 will mean you can't have a charging handle or bolt cover/fake bolt in your ARs.
You can get the toptech gearbox and just disable the pneumatic portion. Upgrade your cylinder head and install a sorbo pad on the cylinder head. That will prevent the gearbox from from cracking off.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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