The Proof Research 22 Long Rifle 16 Twist 16.5" Carbon Fiber Sendero Barrel is a precision-ready prefit upgrade for Zermatt RimX actions. Built around a match-grade steel core wrapped in carbon fiber, this 16.5" Sendero contour barrel combines stiffness with reduced weight, while its 1-16 twist is tuned specifically for .22 Long Rifle performance. The 1/2-28 threaded muzzle makes it easy to add your preferred suppressor or muzzle device without additional gunsmithing.

This barrel is ideal for dedicated rimfire builds focused on accuracy at the range, small-game hunting, or training where consistent point of impact matters. The carbon fiber construction helps manage heat and minimize harmonic vibration, supporting repeatable shot placement over extended strings. With its prefit, shouldered design for the RimX action, installation is straightforward, letting you spend more time shooting and less time at the bench, all backed by Proof Research’s reputation for innovation in lightweight, high-precision barrels.

• Manufacturer: Proof Research
• Model: 22 Long Rifle 16 Twist 16.5" Carbon Fiber Sendero Barrel
• Caliber: 22 Long Rifle
• Barrel Length: 16.5"
• Twist Rate: 1-16
• Muzzle Threads: 1/2-28
• Profile: Sendero