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Discussion Starter · #1 ·
5.7 its pistol size round, nice variety of options, and only like 2 guns out there that use them right now. /drool

Gun Fanatic
826 Posts
5.7 is too hot for a blowback system like HP has. you need a locked gas op system.

the FN Five seveN® operates on delayed blowback operation, it's not too hard to modify the HP design to accomodate a delayed blowback action don't you think?
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