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Proof Research Pre-Fit Bolt Action Barrel – .308 Win, 20", 1:10" Twist, 5-Groove, Stainless Steel, 5/8"-24 Threaded – Drop-In for Sig Cross – 134498 Unlock the true potential of your Sig Cross rifle with the Proof Research Bolt Action Barrel Pre-Fit .308 Win 20" Stainless Steel, 1:10" Twist, 5-Groove, 5/8"-24 Threaded (134498, 843068134498). Designed as a precision drop-in barrel upgrade for the Sig Cross, this match-grade stainless barrel delivers exceptional accuracy, consistency, and durability for shooters who demand more from their lightweight precision hunting and long-range platforms. Whether you’re building a do-it-all backcountry rifle, a rugged precision hunting rig, or a compact long-range setup, this Proof Research pre-fit .308 barrel gives your Sig Cross a serious performance edge. Purpose-Built .308 Win Pre-Fit for Sig Cross This barrel is specifically engineered as a drop-in replacement for the Sig Cross in .308 Winchester: Chambered in .308 Win – one of the most proven and versatile rifle calibers Pre-fit design – made to work with the Sig Cross action with minimal gunsmithing required Ideal for hunters, precision shooters, and long-range enthusiasts wanting a high-end barrel upgrade Instead of a full custom barrel job with complex fitting, you get a ready-to-install, premium barrel that’s built to tight tolerances for repeatable precision. 20" Stainless Steel Barrel – Balance of Length, Weight & Performance This Proof Research pre-fit features a 20-inch stainless steel barrel, a popular length for modern .308 builds: 20" length offers an excellent balance of: Velocity for long-range and ethical hunting shots Manageable overall rifle length for field carry, vehicles, and tight terrain Stainless steel construction helps resist corrosion and wear in harsh environments Engineered as a performance barrel for both range work and hard-use hunting If you want a .308 barrel that’s long enough to perform, but still compact and manageable for real-world use, this 20" configuration is right in the sweet spot. 1:10" Twist Rate – Optimized for Common .308 Bullet Weights The barrel features a 1:10" twist rate (5-groove), ideal for stabilizing a wide range of .308 bullet weights: Excellent for traditional 150–175 grain hunting and match bullets Capable of stabilizing many heavier match bullets used in long-range shooting Provides versatile performance for both: Hunting loads (bonded, soft-point, monolithic) Match and OTM-style precision bullets This twist rate makes the barrel a great choice for shooters who experiment with different bullet weights and brands in their .308 Win rifles. 5-Groove Rifling – Smooth, Consistent, and Accurate Proof Research uses 5-groove rifling in this barrel: Reduces bullet deformation compared to traditional 6-groove rifling Helps promote consistent engagement with the bullet jacket Often associated with excellent accuracy and ease of cleaning If you’re chasing tight groups and repeatable performance, this rifling profile supports the precision that Proof Research barrels are known for. 5/8"-24 Threaded Muzzle – Suppressor & Brake Ready The muzzle is cut with a 5/8"-24 tpi thread, the industry-standard threading for many .30-caliber muzzle devices: Ready to accept: Suppressors and direct-thread cans (where legal) Muzzle brakes for recoil reduction Flash hiders and compensators Makes it easy to configure your Sig Cross for: Recoil management Reduced muzzle rise Suppressed shooting velocity and sound performance If you already own .30-caliber suppressors or brakes, this threading keeps your build modular and compatible. Stainless Steel Match-Grade Construction This Proof Research stainless steel barrel is purpose-built for precision: Made from premium stainless steel selected for strength, consistency, and longevity Match-grade tolerances for: Chamber dimensions Bore concentricity Rifling uniformity Designed to minimize variables that can degrade accuracy over time The result is a barrel that maintains tight groups and predictable point of impact as you put more rounds through it. True Drop-In Design for Sig Cross One of the major advantages of this model is its drop-in compatibility for the Sig Cross rifle: Designed around the Sig Cross barrel interface and system Helps avoid the need for major gunsmithing work in many setups Great option for shooters who: Want to upgrade from the factory barrel Want a second barrel for a specific role or load Want match-grade performance without a full custom build Always verify headspace and function with a qualified gunsmith or follow proper installation practices to ensure safe operation. Upgrade Your Sig Cross for Hunting & Long-Range Precision With this Proof Research .308 Win pre-fit barrel installed, your Sig Cross becomes an even more capable rifle: Ideal for big game hunting where .308 Win is appropriate and legal Perfect for backcountry and mountain hunting, thanks to the compact 20" length and lightweight Sig Cross platform Great for long-range and precision rifle training, steel shooting, and practical accuracy work If you use your Sig Cross as a do-it-all rifle, this barrel gives you the extra edge in consistency, precision, and confidence downrange. Designed for Consistent, Repeatable Accuracy Proof Research barrels are known for delivering excellent accuracy potential when properly installed and combined with quality ammo: Built for cold-bore predictability and tight multi-shot groups Support load development for reloaders who want to tune a .308 Win round to their rifle Helps reduce flyers and inconsistent impacts caused by poor barrel quality Whether you’re punching paper at 100 yards or ringing steel further out, this barrel is designed to track with your dope and data. Perfect for Precision-Minded Sig Cross Owners This pre-fit barrel is perfect for shooters who: Own a Sig Cross in .308 Win and want to upgrade from the stock barrel Want a dedicated precision or hunting barrel with a proven pedigree Appreciate the quality and reputation of Proof Research components Want to improve their rifle without sending it off for months of custom work It’s a premium component built to match the expectations of serious precision shooters and discerning hunters. Key Specs – Proof Research Pre-Fit Barrel .308 Win for Sig Cross (134498) Manufacturer: Proof Research Model: Bolt Action Barrel Pre-Fit Caliber: .308 Winchester Length: 20" Twist Rate: 1:10" Rifling: 5-groove Material: Stainless steel Muzzle Thread: 5/8"-24 tpi Compatibility: Drop-in design for Sig Cross rifles Part Number: 134498 UPC: 843068134498 Why Choose the Proof Research .308 Win 20" Stainless Pre-Fit for Sig Cross? Direct pre-fit upgrade for Sig Cross rifles in .308 Win 20" barrel length balances velocity, accuracy, and handling 1:10" twist, 5-groove rifling optimized for a wide range of .308 bullet weights 5/8"-24 threaded muzzle ready for brakes, comps, and suppressors Stainless steel match-grade construction for precision and longevity Built by Proof Research, a trusted name in high-end precision barrels If you’re ready to take your Sig Cross to the next level in terms of accuracy and performance, the Proof Research Bolt Action Barrel Pre-Fit .308 Win 20" 1:10" Twist (5 Groove), 5/8"-24 tpi Threaded, Stainless Steel, Drop-In Design for Sig Cross (134498, 843068134498) is a premium, purpose-built solution for demanding shooters. The End