The Remington Model 597 is an American semi-automatic rifle that was manufactured by Remington Arms at the company's Mayfield, Kentucky and Huntsville, Alabama plant. The .22 Long Rifle version has a removable 10-round magazine, while the magazines for the larger .22 WMR and .17 HMR cartridges hold eight rounds.

The .22 Winchester Magnum Rimfire, also known as the .22 WMR, .22 Magnum, .22 WMRF, .22 MRF, or .22 Mag, is a rimfire cartridge. Originally loaded with a bullet weight of 40 grains (2.6 g) delivering velocities in the 2,000 feet per second (610 m/s) range from a rifle barrel, .22 WMR is now loaded with bullet weights ranging from 50 grains (3.2 g) at 1,530 feet per second (470 m/s) to 30 grains (1.9 g) at 2,200 feet per second (670 m/s).