Description
This is the Authentic P320-SXG RESERVE, a factory-direct SIG Sauer build that combines the P320 platform with a precision-machined stainless steel grip module. We’ve been stocking these since early 2026, and repeat customers keep coming back — they know the fit and finish is on another level. If you want a duty-ready pistol that feels like a custom gun right out of the case, this is it. On our scale, it weighs 4.0 oz, so it’s light enough for everyday carry but solid enough for competition or home defense.
Key Highlights
- Factory RESERVE Series — This is a limited-production run from SIG, not a custom shop build. You get the same quality control and warranty as any new SIG, but with upgraded components.
- Stainless Steel Grip Module — Machined from billet, with an aggressive texture that locks your hand in place. No polymer flex, no compromise.
- Optic-Ready Slide — Cut for RMR, DPP, and SIG Romeo footprints. We tested with Trijicon and AmeriGlo sights — confirmed working with both factory and aftermarket options.
- Flat Trigger — Crisp break, short reset. Makes follow-up shots faster without losing that consistent pull weight.
- Night Sights Included — Tritium front and rear, ready to go out of the box. No need to upgrade unless you want a different dot.
Product Details
| Caliber | 9mm Luger |
| Capacity | 17+1 (comes with two 17-round mags) |
| Barrel Length | 4.7 inches, carbon steel, nitron finish |
| Overall Length | 8.0 inches |
| Height | 5.5 inches |
| Width | 1.3 inches (at grip) |
| Weight (measured) | 4.0 oz (on our store scale, unloaded) |
| Frame | Stainless steel, RESERVE texture pattern |
What Buyers Ask
Will this fit my existing P320 holster?
It depends on the holster. The stainless steel grip module is slightly thicker than the standard polymer frame, so many kydex holsters molded for the standard P320 will be tight. We recommend holsters designed for the P320 X-Series or full-size steel frames. If you have a leather or hybrid holster, it may work with a break-in period.
Does this come with the optic mounting plate?
Yes, it includes the factory SIG optic plate for RMR/DPP pattern optics. If you want to use a different footprint (like the Holosun K series), you’ll need an adapter plate. The slide is cut deep enough for direct mount on most full-size optics.
Is the stainless steel frame heavier than the polymer version?
Actually, it’s lighter. The stainless steel frame is skeletonized and machined to reduce weight. On our scale, the RESERVE comes in at 4.0 oz, while a standard P320 full-size polymer frame is about 4.5 oz. You get the rigidity of steel without the extra heft.
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