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You'd be surprised, especially if its a semi auto, 5.56 rifle thats got a lifetime warranty for under $400 the 10mm carbine was pushing it..... probably the most powerful cartridge feasible using the straight blowback with a zamak-3/potmetal massive bolt on the basic design.
A streight blow back 5.56 would weigh 36 pounds.
Edit: Like their 9mm.
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