Proof Research SIG Cross Drop-In Barrel, 6.5CM, 18" 5/8-24 Thread, Carbon Fiber

When PROOF Research was formed in 2012, our vision was both simple and extraordinary. Our truly innovative founders envisioned a company that would apply advanced science, new technologies, aerospace-grade materials and manufacturing excellence to produce a new class of products that would truly revolutionize the firearms industry. All PROOF Research barrels are rifled using single-point cut rifling, lead lapped and thoroughly inspected at multiple quality control stations throughout the manufacturing process. Our world class manufacturing process reflects our dedication to our customers and ensuring they are receiving nothing but the best.

Their barrels, both carbon fiber and steel, exemplify their founders’ relentless pursuit of excellence. Whatever your preference is, you can expect the finest rifle barrel in the industry.

Carbon fiber has long been hailed across many industries—aerospace, cycling, alternative energy—as a wonder material making everything lighter and stronger. When employed in a rifle barrel the benefits extend beyond reducing weight and increasing strength. Proof Research's patented manufacturing process begins with full-profile, match-grade 416R stainless steel barrel blanks that are made in their firearms division. These blanks are then turned down to a significantly reduced profile greatly reducing weight. This reduced contour barrel is then wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin developed by their advanced composites division, PROOF Research ACD. The carbon fibers they use have a unique ability to diffuse heat along the length of the barrel (much like fiber optics transmit light). Carbon fiber also moves heat very effectively through the wall (thickness) of the barrel greatly increasing heat transport resulting in barrels that cool faster, maintain accuracy over longer sessions of fire, and live longer. The end result is an aerospace-grade, high-fiber content composite barrel that is stronger, lighter, as accurate as the finest precision steel barrel, and durable to perform in the most demanding environments. They’re not just lighter—they’re better.

• Up to 64% lighter than traditional steel barrels of similar contour
• Match-grade accuracy
• Improved heat dissipation for cooler and longer lasting barrels
• No point-of-impact shift during hight-volume fire
• Reduced harmonic barrel vibration
• Unprecedented durability

The pre-fit barrels for the Sig Sauer Cross rifle are a game-changer when it comes to ease of installation. Your Sig Cross Pre-Fit barrel comes equipped with the barrel extension for shooters to seamlessly upgrade their existing barrel. Crafted with our carbon fiber wrap, these barrels offer remarkable weight reduction without compromising accuracy, making them ideal for shooters seeking enhanced precision and maneuverability.