45-9mm-5-56mm: awesomeness2: thedepthcharger: Sig Sauer MCX. It is operated by a dual short stroke piston gas tappet system with the recoil spring assembly in the upper, so no buffer tube is needed. There will be an integral suppressor available,
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original: https://www.tumblr.com/blog/view/itspronouncedguy-care/67014980559