I'm not keen on box mags either.. unless of course you are wearing a backpack with the weight of 6000 rounds of ammo in it.. Which would be about 200 lbs..
I generally run my Saws on midcaps ( m249 ) with about 120 rounds in a mag
This makes for a more handy weapon.. ans a realistic sustained fire ability
Some guns only have highcaps.. many of the China made WWII style guns only have highcaps.. so in some cases you are buggered..
in this case I require magazines to be removed from the gun to be wound so at least you force a firing interruption to simulate the reload
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If the tongue could cut as the sword does, the dead would be infinite