Cooper Arms Model 21 in 22 BR. The 22 BR is a benchrest-derived wildcat based on the 6mm BR necked to .224, offering exceptional case capacity efficiency and outstanding accuracy potential. Cooper chambers the Model 21 for it as a competition-oriented varmint rifle. Feeds from a single-shot configuration for pure accuracy work. A niche but highly respected chambering among serious benchrest and varmint competitors. Type: Rifle Action: Bolt-Action Caliber: 22 BR Capacity: 1 Year introduced: 1993, USA Weight: 56 oz Overall length: 41.5" Status: Active Intended use: varmint hunting, benchrest competition