U12 by peterku Double barrel. Magazine - remote battery pack is engaged in rear section. Technology designed inside body allows to use this piece only within 200 meters range. This limit determine to use this equipment on space stations. On the other hand reliability is high and it is nearly maintenance free . Battery packs fully satisfy new NTMR standart allowing to charge them on the most charging slots. One battery gives 72 rounds.
Cars, planes and guns evolve as the need to go further does practical desings will show prevalecense for sure.
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