Proof Research CZ 455/457 .22LR 18.5" Threaded Barrel 121443

The Proof Research .22 LR 18.5” Threaded Barrel (121443) brings Proof Research’s legendary aerospace-grade carbon fiber barrel construction to the .22 LR rimfire platform. This prefit carbon fiber barrel features a precision stainless steel liner wrapped in Proof’s proprietary high-fiber content composite — delivering match-grade accuracy, up to 64% lighter weight than traditional steel barrels of similar contour, and significantly improved heat dissipation for longer, more accurate range sessions. The 18.5-inch bull barrel profile provides excellent velocity for .22 LR while the 1/2”-28 threaded muzzle enables use of a suppressor for quiet target shooting, rimfire training, and small game hunting.

Proof Research’s carbon fiber material has a unique ability to diffuse heat along the length of the barrel (similar to how fiber optics transmit light) and moves heat very effectively through the barrel wall — resulting in barrels that cool faster, maintain accuracy over longer sessions of fire, and live longer. The result is no point-of-impact shift during high-volume fire and reduced harmonic barrel vibration. The prefit shouldered design makes installation straightforward — thread it onto your receiver, torque it down, and head to the range. No gunsmithing required.

Designed for precision rimfire rifles including the Ruger 10/22 platform and compatible .22 LR actions, this Proof Research carbon fiber barrel is the ideal upgrade for competitive rimfire shooters, suppressor enthusiasts, small game hunters, and anyone seeking maximum performance from their .22 LR rifle. Made in the USA by Proof Research in Kalispell, Montana.

• Brand: Proof Research
• SKU: 121443
• Caliber: .22 LR (22 Long Rifle)
• Barrel Length: 18.5 inches
• Barrel Contour: Bull Barrel (4 Groove)
• Twist Rate: 1:16”
• Muzzle Thread: 1/2”-28
• Construction: Stainless steel liner, aerospace carbon fiber wrap
• Weight Savings: Up to 64% lighter than traditional steel barrels
• Accuracy: Match-grade
• Installation: Prefit shouldered barrel, no gunsmithing required
• Country of Origin: Made in USA (Kalispell, Montana)
• Best For: Suppressed .22 LR shooting, rimfire competition, small game, target shooting