Proof Research Bolt Action Barrel Pre-Fit 260 Rem 20" 1:8" Twist (5 Groove), 5/8"-24 TPI, Stainless Steel, Drop-In Design for Sig Cross 138960: Precision Stainless Upgrade for Serious Shooters
Unlock the full potential of your Sig Cross rifle with the Proof Research Bolt Action Barrel Pre-Fit 260 Rem 20" Stainless Steel 138960. Designed for shooters who demand next-level precision and consistency, this 20-inch, 1:8" twist, 5-groove stainless steel barrel is a true drop-in upgrade that transforms your Sig Cross into a long-range tack driver.
Chambered in 260 Remington, threaded 5/8"-24 TPI, and built from high-grade stainless steel, this Proof Research pre-fit barrel delivers exceptional accuracy, durability, and ease of installation. Whether you’re a precision rifle competitor, long-range hunter, or serious enthusiast, this barrel is engineered to give you repeatable performance and confidence with every shot.
Engineered for 260 Remington Long-Range Performance
The 260 Remington is highly regarded for its:
Paired with the Proof Research 20" stainless barrel, this cartridge truly shines. You get:
Consistent velocities ideal for long-range shooting
Excellent energy retention for hunting medium to large game
Superior precision when paired with modern high-BC bullets
If you want a cartridge that balances range, recoil, and accuracy, 260 Rem in a Proof barrel is a proven choice.
20" Stainless Steel Barrel – Balance of Velocity, Rigidity, and Handling
This pre-fit barrel features a 20-inch stainless steel profile, carefully chosen to offer:
Excellent velocity without excessive length
Improved rigidity for tighter groups and reduced barrel whip
Good maneuverability for field use, hunting, and practical shooting
Stainless steel construction is known for:
Long-term corrosion resistance
Consistent performance in varying weather conditions
Excellent barrel life with proper maintenance
Whether you’re shooting in wet, cold, or dusty environments, stainless steel gives you peace of mind and consistent accuracy.
1:8" Twist Rate with 5-Groove Rifling – Designed for Modern Bullets
The 1:8" twist rate (5-groove) is optimized for the wide range of bullet weights commonly used in 260 Rem:
Stabilizes popular 120–147 grain match and hunting bullets
Ideal for high-BC projectiles used in long-range and precision shooting
5-groove rifling often contributes to reduced bullet deformation and excellent consistency
No matter if you’re shooting factory match ammo or carefully crafted handloads, this twist rate and rifling combination supports outstanding precision.
5/8"-24 TPI Threaded Muzzle – Ready for Suppressors and Muzzle Devices
The muzzle comes threaded 5/8"-24 TPI, the industry-standard threading for many .30-caliber-class rifles:
Install suppressors to reduce sound and recoil
Add a muzzle brake or compensator for better control in rapid strings
Use a flash hider for low-light or tactical applications
The threaded design lets you tailor the barrel to your needs, from competition to hunting to tactical use.
True Drop-In Design for the Sig Cross
The Proof Research Pre-Fit 138960 is specifically engineered as a drop-in barrel for the Sig Cross:
No need for complex gunsmithing
No specialized tools required beyond basic rifle tools
Headspace and fit are pre-engineered for the Sig Cross platform
That means less time at the bench and more time behind the rifle, shooting tighter groups and stretching the distance.
Precision-Crafted by Proof Research
Proof Research is known worldwide for its:
With this stainless pre-fit barrel, you benefit from:
Uniform bore and groove dimensions
Carefully controlled chamber geometry
Excellent cold-bore and shot-to-shot consistency
When you upgrade to a Proof Research barrel, you’re investing in a component designed from the ground up to improve your rifle’s performance.
Ideal For:
Long-Range Shooters – Stretch the 260 Rem to its full potential with a precision stainless barrel
Hunters – Get a durable, weather-resistant barrel perfect for mountain, field, or backcountry hunts
PRC / PRS & Competition Shooters – Enjoy a consistent, reliable barrel that keeps your groups tight over long strings
Precision Enthusiasts – Upgrade your Sig Cross with a premium barrel that maximizes accuracy
Key Specifications – Proof Research Pre-Fit 260 Rem Stainless for Sig Cross (138960)
Caliber: 260 Remington
Barrel Length: 20"
Twist Rate: 1:8" (5-groove rifling)
Material: Stainless steel
Muzzle Threads: 5/8"-24 TPI
Design: Pre-fit, drop-in barrel for Sig Cross rifles
Model Number: 138960
Platform: Sig Cross bolt-action rifle
Why Choose the Proof Research 20" Stainless Pre-Fit Barrel for Your Sig Cross?
Purpose-built for the Sig Cross – No guesswork, no fitting headaches
Premium stainless steel – Durability, corrosion resistance, and long-term consistency
Optimized twist and rifling for 260 Rem long-range and hunting loads
Threaded muzzle – Ready for brakes, suppressors, and flash hiders
Proof Research quality – Trusted by serious shooters, competitors, and professionals
If you’re ready to take your Sig Cross to the next level in accuracy and performance, the Proof Research Bolt Action Barrel Pre-Fit 260 Rem 20" 1:8" Twist (5 Groove), 5/8"-24 TPI Threaded, Stainless Steel, Drop-In Design for Sig Cross 138960 is the upgrade that delivers.
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