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A few of the Warmongers went the route of trying to use the mag with HPA, pressure I think around 100-120fps, in a KJW M700 sniper rifle. Failed miserably, as said above only a couple shots then it went dead.
I KNOW that some guys in the US have set up 600fps KJW M700s with an external tank, and word is they work great, but for a GBB............ no way. MP5.......... MAYBE, but since you can just get an AEG MP5............ you then enter into the land of 'Why bother?'
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