Cooper Arms Model 21 chambered in 223 Remington. The 223 Rem is the bread-and-butter varmint cartridge for the Model 21, and Cooper's short action was dimensioned with it in mind. Hand-fitted barrel, three-rear-lug bolt, and a trigger adjustable down to competition weights. This is the rifle Cooper built its reputation on — capable of genuine sub-quarter-MOA groups from a production rifle. Type: Rifle Action: Bolt-Action Caliber: 223 Remington Capacity: 1 Year introduced: 1991, USA Weight: 56 oz Overall length: 41.5" Status: Active Intended use: varmint hunting, target shooting, competition