The Clip-Rite was designed primarily for our new larger capacity XT15 and XT10 Marlin 22 LR Magazines. The larger capacity magazines have a tendency due to the weight, not to align properly with some Marlin Rifles, which makes the feeding of the rounds difficult. The Clip-Rite will go onto the bottom large screw on top of the magazine well plate and curve inside the magazine well. This will allow the larger capacity magazines to be at the correct angle to feed and cycle the rifle correctly. You can also use it for the traditional 7 round magazine if you feel the feeding and cycling of the rounds are not optimum. We hope this accessory will help you enjoy your new magazine. We made the hole oblong so you can move it forward and backward depending on your situation. Thank You, American Rifle Magazines.