Sometimes you need More Dakka, but the turret is fixed to the ground. What do you do? Grab a hold of the gun, steady yourself, and tear the BFG from its mount. In Video Games, there will most likely the drawback that if the turret gun had Bottomless Magazines when mounted, then the gun would lose that once you detach it, as well as slowing you down. A Sub-Trope of Improbable Use of a Weapon. It should be noted however, that many gun emplacements from the Great War/War World Two era (especially plane turrets) were equipped with light machine guns that were designed to be carried.