PROOF Research 139004 Bolt .284 18 8TW Extra Barrel

The PROOF Research 139004 Bolt .284 18 8TW Extra Barrel is designed for firearm enthusiasts, gunsmiths, and builders seeking a precision replacement or additional barrel option for a compatible bolt-action platform. Built around a .284 caliber configuration, this barrel is identified by an 18-inch length and 8TW twist specification for straightforward selection and fitment planning. Its clearly defined configuration helps simplify the process of matching a barrel to the intended rifle, action, and ammunition setup.
PROOF Research is known for producing specialized barrel components for demanding shooting applications, and part number 139004 provides a specific reference for ordering and installation. The extra-barrel format makes this component a practical choice for users who want to configure a compatible bolt-action rifle for a different caliber or maintain a spare barrel for future use. Before purchasing or installing, verify chambering, action compatibility, threading, contour, and any required gunsmithing work with the firearm manufacturer or a qualified professional.
This PROOF Research barrel is intended for users who prioritize correct component selection and dependable integration into a compatible rifle system. The 18-inch profile offers a compact barrel configuration, while the 8TW designation identifies the rifling twist specification needed when evaluating bullet compatibility and load selection. Always follow applicable firearm safety practices, use ammunition appropriate for the chambering, and have installation, headspace checks, and final inspection completed by a qualified gunsmith. The PROOF Research 139004 part number should be retained for reference when confirming replacement parts, technical information, or compatibility.

Features:

• Brand: PROOF Research

• Part Number: 139004

• Product Type: Extra barrel for a compatible bolt-action rifle platform

• Caliber: .284

• Barrel Length: 18 inches

• Twist Rate: 8TW

• Application: Suitable for qualified gunsmith installation after confirming firearm compatibility