Magazine (Mag) Well

closeup of pistol mag well
mag well of rifle

A magazine (mag) well is the area of a firearm into which magazines are inserted. Different forms of magazine inserts exist, most notably where the magazine locks in or slides in and is locked in place until the magazine release is pressed to allow the magazine to be separated from the firearm. On a semi-auto handgun, the magazine well is at the base of the grip, while on rifle, it is usually placed in front of the trigger guard.

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