Feeding problems and jams in your AR-15 can often be attributed to bent or malformed magazine feed lips. This easy-to-use tool is designed specifically to bend the feed lips back into place, so they guide the cartridge body like they re supposed to. Trying to straighten the lips with pliers can create rough, unsightly gouges, or worse yet, cracks in the metal that can t be repaired. The machined, steel shank with bevel cut and slot allows you to hook the lips and keep them supported, while you tweak their angle of contact on the cartridge case. Helps you recondition those old magazines, and saves the cost of buying new ones.