barrel whip

barrel whip

[′bar·əl ‚wip]
(ordnance)
The movement of a gun barrel in a plane normal to the longitudinal axis of the gun bore, as the gun operates through a complete firing cycle.
References in periodicals archive ?
Unfortunately, we can't totally prevent barrel whip.
Ported tubes allow gases to leave the muzzle evenly, reducing barrel whip.
Doing so results in the total elimination of barrel whip and in significantly smaller barrel oscillations when the gun is fired.