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| CZ 452 or BRNO .22 Rifle or ZKM-452 | |
|---|---|
 CZ 452 with a fitted suppressor | |
| Type | Hunting or target rifle |
| Place of origin |  Czech Republic |
| Production history | |
| Designer | Josef Koucký (1904-1989) |
| Designed | 1943-44 |
| Manufacturer | Česká Zbrojovka Uherský Brod |
| Produced | 1956-2017 |
| Variants | CZ 453, CZ 513 |
| Specifications | |
| Barrel length | 16.2 in (410 mm) to 28.6 in (730 mm) dependent on model |
| Cartridge | .22 LR, .22 WMR, .17 HM2, .17 HMR |
| Action | bolt-action repeater |
| Effective firing range | 200 meters |
| Feed system | 5-round detachable magazine (standard); 10- and 25-round magazines and single-shot adapter available |
| Sights | open (some models); 3/8" or 11 mm dovetail rail for optional optical sights |
The CZ 452, also known as BRNO Model Two .22 Rifle is a series of magazine-fed bolt-action rimfire repeating rifles manufactured by the Czech firearms manufacturer Česká Zbrojovka Uherský Brod (abbreviated "CZ-UB", English: Czech Weapons Factory — Uherský Brod) and imported into the United States by CZ-USA. Most versions of the 452 rifle series were discontinued in 2011 and replaced by the CZ 455, although CZ continues to offer the CZ 452 American in a left-hand model, with the bolt handle and ejection port located on the left side of the rifle.
During its production life, the CZ 452 was produced in several versions with various barrels, stocks and sights for a variety of rimfire cartridges such as .22 LR, .22 WMR, .17 HM2, and .17 HMR.