PROOF Research Bolt-Action Barrel Blank | .243 Cal | 18" | 1:7.5 Twist | Sendero Contour | Carbon Fiber

Built for precision custom rifle builders, the PROOF Research 104514 is an 18" carbon fiber wrapped bolt-action barrel blank chambered in .243 (6mm) with a 1:7.5 twist rate and Sendero contour. It ships barrel-blank ready — your gunsmith threads and chambers it to spec — giving you a lightweight, match-grade foundation for a long-range hunting or competition build. At just 2 lbs 10 oz, it delivers significant weight savings over comparable steel contours without sacrificing rigidity or accuracy.

PROOF Research's patented carbon fiber wrapping process produces barrels that are stiffer, lighter, and dissipate heat faster than traditional steel — translating to better accuracy over extended shooting sessions and longer barrel life. The core is 416R stainless steel, match-grade cut rifled, and wrapped in aerospace-grade carbon fiber impregnated with a proprietary matrix resin.

Features

• Carbon fiber wrapped 416R stainless steel core — up to 64% lighter than comparable steel contours without sacrificing stiffness or accuracy
• Sendero contour — a proven profile balancing weight reduction with rigidity for long-range precision work
• 1:7.5 twist rate — stabilizes heavier .243 projectiles for long-range and precision shooting applications
• Superior heat dissipation — carbon fiber sheds heat faster than steel, maintaining accuracy over longer strings of fire
• Homogeneous microstructure — responds uniformly to heat treatment, providing consistent hardness along the full barrel length
• Excellent machinability — optimized for gun drilling, reaming, and uniform lapping by your gunsmith
• High erosion and corrosion resistance — built to withstand extreme chamber pressures and extended use
• Ships ready for threading and chambering — wildcat and standard chambers supported

Specifications

• Manufacturer: PROOF Research
• MFR #: 104514
• UPC: 843068104514
• Item #: 195863
• Caliber: .243 Winchester (6mm)
• Barrel Type: Bolt-Action Barrel Blank
• Construction: Carbon Fiber Wrapped / 416R Stainless Steel
• Barrel Length: 18"
• Twist Rate: 1:7.5
• Contour: Sendero
• Breech Length: 2.50"
• Shank Diameter: 1.20"
• Weight: 2 lbs 10 oz
• Finish: Carbon Fiber / Silver
• Country of Origin: USA

This is an unfinished barrel blank. Threading and chambering by a qualified gunsmith is required before installation and use. Wildcat chambers are supported but PROOF Research cannot guarantee accuracy, velocity, or stability for non-standard chamberings. Check all local, state, and federal laws before purchasing.

FFL-REGULATED ITEMS: Firearms must ship to a federally licensed dealer (FFL). NFA-regulated items including suppressors, short-barreled rifles, and machine guns must comply with all applicable ATF and SOT requirements. Export or transfer of these items may be restricted under U.S. law. Additional details are provided at checkout.

EXPORT NOTICE: This product and any related technical data may be subject to U.S. export control laws and regulations, including the International Traffic in Arms Regulations (ITAR), Export Administration Regulations (EAR), Arms Export Control Act (AECA), Export Administration Act (EAA), International Emergency Economic Powers Act (IEEPA), and all applicable ATF regulations. Export, re-export, or disclosure of this product or related data to non-U.S. persons or foreign nationals — whether inside or outside the United States — may be strictly prohibited without prior written authorization from the U.S. Government. Violations may result in severe civil and criminal penalties, including substantial fines and imprisonment.