Unlock the full potential of your Sig Cross rifle with 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 (SKU: 134498 | UPC: 843068134498). Designed for shooters who demand superior accuracy, durability, and ease of installation, this pre-fit barrel delivers custom-rifle performance in a convenient, user-friendly package.
Whether you’re building a precision rifle, upgrading your hunting rig, or tuning your setup for practical or tactical applications, this PROOF Research stainless pre-fit barrel is engineered to help you shoot tighter groups, stretch your effective range, and maintain reliability in the harshest conditions.
Engineered Specifically for .308 Winchester Performance
Chambered in .308 Winchester, this 20" barrel is optimized for one of the most trusted and versatile calibers in the world. From hunting elk in rugged terrain to running steel in dynamic long-range matches, .308 Win is known for:
Proven terminal performance on medium and large game
Wide availability of factory ammunition
Reliable ballistics and manageable recoil
The 20-inch barrel length offers an ideal balance between ballistic performance and portability. It gives you enough length to take advantage of .308 Win’s powder burn and velocity while keeping your Sig Cross light, handy, and quick to maneuver in the field or on the range.
1:10" Twist Rate With 5-Groove Rifling
This barrel features a 1:10" twist rate, the classic choice for .308 Winchester. It is optimized to stabilize a wide range of bullet weights, especially heavier projectiles commonly used for long-range shooting and hunting, such as 165–180 grain loads.
Combined with 5-groove rifling, this twist rate configuration helps unlock maximum accuracy potential:
Improved bullet alignment and stability for better long-range consistency
Reduced bullet jacket deformation, which can enhance downrange performance
Superior gas seal for consistent velocities shot after shot
Smoother internal geometry that often makes cleaning easier
For shooters who demand repeatable precision, 5-groove rifling with a 1:10" twist in .308 Win is a winning formula.
Premium Stainless Steel Construction
Built from high-grade stainless steel, the PROOF Research pre-fit for Sig Cross is designed to thrive in real-world conditions:
Corrosion resistance in moisture, snow, and high humidity
Excellent barrel life even with regular range use
Thermal stability for consistent performance in changing temperatures
Whether you’re hiking through rain-soaked timber, sitting in a cold blind, or firing long strings on the range, this stainless barrel is made to keep delivering consistent point of impact and rock-solid reliability.
5/8"-24 tpi Threaded for Muzzle Devices and Suppressors
The muzzle is factory threaded 5/8"-24 tpi, the industry-standard threading for most .30-caliber muzzle devices and suppressors. This gives you maximum flexibility to configure your rifle exactly how you want it:
Add a muzzle brake to reduce felt recoil and muzzle rise
Install a flash hider for low-light or tactical applications
Attach a suppressor or direct-thread adapter for reduced blast and report
With no extra gunsmithing required, the threaded design ensures your Sig Cross .308 Win is suppressor-ready and fully compatible with modern muzzle devices right out of the box.
True Drop-In Pre-Fit Design for Sig Cross
This barrel is purpose-built as a pre-fit, drop-in design for the Sig Cross platform, making it an exceptional choice for shooters who want custom-level performance without the hassle of a custom installation.
Key advantages of the drop-in design:
No complex gunsmith fitting typically required
Minimal downtime – quickly swap and torque to spec
Consistent headspacing when installed according to manufacturer guidelines
That means more time shooting and less time waiting on a workbench. You get the convenience of a factory-style replacement with the performance of a premium aftermarket barrel.
Versatile 20" Barrel for Hunting, Precision, and Practical Use
The 20" length is a versatile sweet spot for .308 Win:
Hunting – Easy to carry through brush, timber, or steep terrain
Precision & Practical Shooting – Long enough for stable velocities and solid long-range performance
Field & Tactical Use – Shorter overall length when paired with a suppressor, making it more manageable in vehicles, blinds, or tight shooting positions
From backcountry hunts to range days and field matches, this barrel is made to adapt to a wide variety of real-world shooting applications.
Technical Specifications
Manufacturer: PROOF Research
Model: Bolt Action Barrel Pre-Fit for Sig Cross
Caliber: .308 Winchester (.308 Win)
Barrel Length: 20 inches
Twist Rate: 1:10"
Rifling: 5-Groove
Material: Stainless steel
Thread Pitch: 5/8"-24 tpi
Design: Drop-In pre-fit for Sig Cross rifles
SKU: 134498
UPC: 843068134498
Why Upgrade to a PROOF Research Pre-Fit Barrel for Your Sig Cross?
Choosing the PROOF Research .308 Win 20" 1:10" Twist, 5-Groove Stainless Pre-Fit Barrel for your Sig Cross gives you:
Enhanced accuracy and consistency with match-grade geometry
Improved handling with an ideal 20" barrel length
Suppressor-ready convenience with 5/8"-24 muzzle threading
Long-lasting durability from premium stainless steel
Quick, straightforward installation thanks to the true drop-in pre-fit design
If you’re looking to get more out of your Sig Cross in .308 Winchester—whether that means tighter groups, longer effective range, or more confidence behind the rifle—this PROOF Research barrel is a high-performance upgrade you can count on.
"The End"
