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the m16/big box on the back of upper receiver is a first factory mod for p90s to take the m16 mag as the p90 hicaps have a serious jamming issue and there arent many locaps around these forums. switching to m16 mags solves this problem as there are plenty of those around.
this mod also allows for a large battery to fit in (preferably in a black pouch or something...)where the p90 mag usually sits.
silencer is so long because more than likely it houses an extended inner barrel.
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