9mm vityaz ak VS HK mp5

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Sharpshooter
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The cmmg AR9 pistol is a delayed blow back. It is interesting how it works. The Bolt lugs are angled and gas key is deleted. That one may interest you.

Those still use the buffer tube for the recoil spring dont they? So you cant shoot it while folded and you always have the length of the tube out back.
 

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