This is possibly the only thing that can make a Buck Mark pistol more fun to shoot. With an extra magazine for your Buck Mark pistol, you can load up and shoot long enough to get into your shooting groove. Thumb button allows you to push the follower down easily for loading. One of the best rimfire pistol magazine designs ever. Features:Detachable box magazine with heat treated steel body for long lifeSteel coil spring for maximum feeding reliabilityCapacity is ten rounds and fits both Buck Mark pistols and rifles