It's not the fact that it can still swivel if well balanced at virtually any size. It's that when you touch-off one that's too large, no bar is going to prevent that thing from kicking back on you and actually sending the round god knows where. Larger and longer barrels equate to either more charge capacity or more gas compression. There is no outguessing for this either. So it all comes as recoil. The bigger the gun, the more it takes to keep it under control while discharging. There's an upper limit on what a man can manage in this respect.
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