This is a Winchester magazine end cap assembly for a Model 1892 (also M53) for a small caliber (.25-20, .32-20, .218 Bee) rifle or carbine with a full magazine (square edges on the end like the barrel). It includes the body, lever, mounting screws, spring and plunger. The lever does not have a patent date being of late production and/or replacement part. It requires a slot in the barrel bottom to lock into when the lever is folded down.