Sig Sauer 1911 Nitron .45 ACP
Model: 1911R-45-BSS
Sig Sauer 1911 Nitron .45 ACP
Model: 1911R-45-BSS
Full Specifications
About This Firearm
The Sig Sauer 1911 Nitron is a single-action .45 ACP built for range work and home defense. Sig no longer lists it, so it's a used buy. Frame, slide and barrel all carry Sig's Nitron finish, which puts the same hard grey surface on stainless frame, stainless slide and carbon steel barrel.
The safeties are the 1911 set plus a firing pin safety, with an extended thumb safety and a beavertail grip safety. Nothing on the gun adjusts, and the rosewood panels are the softest material on it. There is no optic cut in the slide. Since Sig has dropped its 1911 line, a buyer is working from the used market for spares as well as for the gun, and the finish deserves a close look, because Nitron goes thin at the muzzle and the slide corners before anything mechanical shows wear.
If you're cross-shopping current guns, the Ruger SR1911 is the stainless 1911 at an MSRP of $1,259, 39 oz with a 5-inch barrel, drift-adjustable Novak three-dot sights, a skeletonized aluminum trigger and eight rounds. The Springfield Armory Garrison is the cheaper route at an MSRP of $878, 37 oz of blued forged steel with low profile combat three-dot sights and seven rounds. Both come with a factory warranty, which a used Sig 1911 does not.
Best For
Strengths & Limitations
- Stainless frame and stainless slide under Nitron, so a scratch through the finish does not start rusting.
- Rosewood grip panels, which are a refinishable part instead of a molded one.
- An extended thumb safety and a beavertail grip safety were factory parts, so no gunsmith work was needed to get there.
- Sold used with no factory support, which means parts and service come from the 1911 aftermarket.
- No optic cut and no accessory rail, so a dot or a light means permanent work on a discontinued gun.
Category Rankings
How the Sig Sauer 1911 Nitron .45 ACP ranks among full-size .45 ACP handguns.
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Frequently Asked Questions
Is it still in production?
No. Sig no longer lists this .45 ACP 1911, so it comes off the used market.
What is Nitron?
Sig’s surface finish, used here on the stainless frame and slide and on the carbon steel barrel. It is a hard grey surface treatment, not a paint, so wear shows as polishing at the high spots.
What safeties does it have?
An extended thumb safety, a beavertail grip safety and a firing pin safety.
What should be checked on a used one?
Barrel fit and bushing play, the condition of the Nitron at the muzzle and slide corners, and the firing pin safety, which should let the trigger break just when the grip safety is depressed.
