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tm mp5k uses ver III mechbox (so that the battery can go into the "recoil spring" area of the gun. mp5a and sd series use ver II mechbox. the lower on my mp5k is different from the a5 and sd lower as it doesn't have to mount either retractable or solid stock. someone may make an early or a2 lower for mp5k, but i've never seen it. someone here may have done a mod to accomplish what you want.
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