Cooper Model 21
Cooper Firearms of Montana, Inc. · Rifle · In Production · 1994
Also known as: Cooper Arms Model 21, Cooper M-21, Cooper 21 Varmint Extreme
Overview
The Cooper Model 21 is a single-shot bolt-action varmint rifle built by Cooper Firearms of Montana around a compact three-lug 'mini' action sized for the .223 Remington cartridge family. Hand-fitted, with a precision-lapped stainless barrel and a figured walnut stock, the Model 21 is a custom-quality precision rifle famous for its sub-half-MOA accuracy guarantee. It is offered in numerous chamberings derived from the .223 case head, including .222 Remington, .223 Remington, .17 Remington and the .204 Ruger.
Specifications
| Weight (empty) | 3400 g (119.9 oz) |
| Overall Length | 1118 mm (44.02") |
| Barrel Length | 610 mm (24.02") |
| Action Type | Bolt Action |
| Firing Mechanism | Striker Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 1 rounds |
| Magazine Type | Fixed Box |
| Muzzle Velocity | 990 m/s (3248 fps) |
| Muzzle Energy | 1745 J (1287 ft·lbf) |
| Effective Range | 500 m (547 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 305 mm (12.01") |
| Frame Material | Steel |
| Barrel Material | Stainless Steel |
| Stock Material | Walnut |
| Finish | Blued |
Calibers
- .223 Remington · primary — also known as .223 Rem, 223 Remington, .223 Wylde (chamber), 5.56x45mm
Features
- Firing modes: Repeating
- Feed systems: Single Shot
- Safety mechanisms: Manual Safety
- Features: Three Lug Bolt, Single Shot Action, Match Grade Barrel, Hand Lapped Barrel, Adjustable Trigger, Sub Moa Accuracy Guarantee
Variants
- Cooper Model 21 Varmint Extreme - Varmint
- Cooper Model 21 Montana Varminter - Varmint
- Cooper Model 21 Phoenix - Tactical
Production
Production years: 1994-present
Low-volume custom production from Stevensville, Montana; Cooper Firearms was acquired by Nighthawk Custom in 2023.
Origin
Country of origin: United States
Designer: Dan Cooper
Notes
The Model 21 is the centerfire member of Cooper's compact mini-action family (the rimfire Model 57 and varmint Model 38 share the same scaled action). Many configurations are single-shot; some are offered as repeaters with a detachable magazine.
Background
Cooper Firearms of Montana was founded in 1990 by Dan Cooper and former Kimber of Oregon employees to build affordable custom-quality accurate rifles. The team began experimenting with a single-shot .223 varmint rifle in 1993, and that three-lug action paired with an innovative stock became the Model 21 'Varmint Extreme'. Cooper's famous 1/2-inch-at-100-yards accuracy guarantee for centerfire rifles began in 1998.