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The Proof Research 138960 takes one of the best-kept secrets in the reloading world and drops it right into your Sig Cross. Chambered in .260 Remington, this 20-inch stainless barrel gives you the flat-shooting, wind-bucking performance of a 6.5mm bullet in a case built off the proven .308 Winchester family. For long-range work and Western hunting where the wind never quits, that combo is tough to beat, and the 1:8 twist keeps heavier, high-BC 6.5 bullets stabilized out where it counts.
The whole point of a pre-fit is skipping the wait. Proof builds this barrel chambered, threaded, and headspaced, and it ships with the barrel extension already fitted. That means you can pull your factory barrel and install this one at your own bench with the right tools, instead of boxing up your rifle and waiting on a gunsmith. It's a genuinely easy way to turn a single Cross into a multi-caliber setup down the road.
Proof's stainless barrels start with double stress-relieved 416R, the pre-hardened chromium stainless that's become the gold standard for match-grade bores. Each one is single-point cut-rifled, hand-lapped, and borescope-inspected before it leaves the shop. The five-groove bore and 8-inch twist deliver the kind of consistency you'd expect from a company that took over Lawrence Barrels and their decades of steel-barrel know-how. You get familiar thermal behavior and true precision-rifle accuracy, all at a friendlier price than the carbon-wrapped versions.
The muzzle comes cut with a 5/8-24 thread, the standard pitch for .30-caliber-and-under muzzle devices and suppressors, so mounting a brake or can is straightforward. At right around 4 pounds 6 ounces, this 20-inch profile strikes a solid balance between a barrel that holds steady on target and one you can still carry up the mountain. Whether you're building out a PRS trainer or a backcountry rig, this one earns its keep.
No, that's the whole idea behind a pre-fit. The barrel arrives chambered, threaded, and headspaced with the barrel extension already fitted, so you can swap it onto your Sig Cross at home with the correct tools. It's designed to let you change calibers or replace a worn barrel without shipping your rifle off.
The .260 Rem launches the same high-BC 6.5mm bullets and delivers very similar downrange ballistics with excellent wind performance. It's built on the .308 Winchester case, which gives it a slightly longer neck that many handloaders appreciate. For anyone rolling their own ammo, it's a proven, accurate cartridge that shines at distance and on Western game.
Both start from the same match-grade 416R stainless and Proof's single-point cut rifling, so accuracy standards are the same. The carbon-wrapped versions shave weight and add stiffness, while this stainless model gives you familiar thermal behavior at a more approachable price. If weight savings isn't your top priority, the stainless is a smart pick.
Yes. The muzzle is threaded 5/8"-24, which is the standard pitch for .30-caliber-and-under muzzle devices and suppressors. Just match your brake or can to that thread spec and you're good to go.
| UPC | 843068138960 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 138960 |
| Length | 20" |
| Model |
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