As GT Garwood defines it muzzle-flip is a phenomenon that causes a particular gun to shoot lower than other guns with similar rib to barrel axis angles. Recoil causes a gun to shoot higher if the buttstock is lower than the axis of the barrel(s). I have seen some combat rifles set up so the barrel axis goes through that of the buttstock. I assume this is to eliminate muzzle rise during automatic fire.

Garwood said muzzle-flip usually occurred in longer barreled SxS small bores.

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