For a right-handed shooter, the correct position for the left hand while firing is on the ventilated barrel-casing, but not on the magazine, as the pressure from holding the magazine can increase the risk of stoppages, and a loose magazine can lead to dropping the weapon. The barrel-casing hold provides greater control of the weapon, so the right hand can intermittently be used for other tasks. A semi-circular protrusion on the right-hand side of the weapon, approximately two inches from the muzzle, serves to prevent the supporting hand from moving too far forward and over the muzzle.