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Proof Research took the biggest headache out of running a Sig Sauer Cross and made it a bench-top job. This 20" stainless steel pre-fit barrel is chambered in 6mm Creedmoor and shows up with the barrel extension already fitted and the headspace set at the factory. That means no shipping your rifle off, no gunsmith invoice, and no fussing with go gauges. You spin it into place, torque it down, and you're ready to load up.
The 6mm Creedmoor is one of the best flat-shooting, low-recoil cartridges going right now. It pushes high-BC bullets past 3,000 fps, so it bucks wind and stays flat well past where most hunters and target guys are shooting. The 1:7.5 twist here is the sweet spot for the heavy match bullets, the 105 to 115 grain crowd like the 108 ELD Match and 110 A-Tip, which is exactly what you want if you're stretching things out on steel or in a match. That 20" length is a smart middle ground too, giving up very little velocity while keeping the rifle handy and well balanced.
Proof starts with 416R stainless steel, then cut-rifles and hand-laps the bore for a five-groove finish that shoots clean and consistent. The muzzle wears 5/8"-24 threads, so your existing brake or suppressor bolts right up. Proof and a small handful of makers are the only ones offering a true drop-in Cross barrel that ships headspaced with its own extension, so this is about as painless as a caliber change gets on this platform.
Whether you're building a dedicated 6mm rig for long range or just want a lighter-recoiling option alongside your .308 or 6.5, this is a straightforward way to get there. It's a quality barrel from a company that has earned its reputation, and it does exactly what it says on the box.
No. This barrel ships with the barrel extension already installed and the headspace set at the factory, so it's a drop-in swap you can do at home. You'll want the correct barrel wrench and a torque wrench to seat it properly, but no gauges or gunsmithing are required. Proof is one of the few makers that includes the extension so you don't have to reuse the one off your old barrel.
That fast twist is built for the heavy match bullets in 6mm, roughly the 105 to 115 grain range. Popular choices like the 108 grain ELD Match, 109 grain LRHT, and 110 grain A-Tip all stabilize well. If you plan to run lighter varmint bullets you can, but this barrel really shines with the long, high-BC projectiles.
This one is the stainless steel model built from 416R stainless. Proof also offers a carbon fiber wrapped version of the Cross pre-fit that runs lighter, but part number 134573 is the all-steel option. Both are cut-rifled and hand-lapped to the same accuracy standard.
The muzzle is threaded 5/8"-24, which is the standard pitch for the Sig Cross and most .30-caliber-and-under cans and brakes. Your existing muzzle device should thread right on. Just confirm your suppressor's bore is rated for 6mm before mounting it.
| UPC | 843068134573 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 134573 |
| Length | 20" |
| Model |
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