Description
The Sig Sauer P226 Nightmare 10 Round exists so a magazine limit does not push a buyer into a lesser pistol. Everything that makes the XFive Nightmare worth owning is here unchanged: the five-inch bull barrel, the all-steel frame, the single-action trigger and the Hogue G10 Nightmare grips. MAG5 Firearms stocks it with ten-round magazines.
A Full Competition Pistol in Compliant Form
Compliant versions are usually where manufacturers cut corners. Not here. The barrel, frame, slide, trigger and grips on the Sig Sauer P226 Nightmare 10 Round are identical to the standard-capacity gun. Only the magazines in the box differ.
Drop in whatever capacity your jurisdiction allows and nothing about how the pistol behaves changes, because the magazine well is the same.
Sig Sauer P226 Nightmare 10 Round Bull Barrel and Steel Frame
The bull barrel concentrates weight at the muzzle where it damps rise, and the steel frame adds mass low in the hand. Together they make the Sig Sauer P226 Nightmare 10 Round track flat enough that the dot barely leaves the target between shots.
With standard-pressure 9mm this pistol feels close to recoilless, which is the point of building a competition gun out of steel rather than polymer.
Sig Sauer P226 Nightmare 10 Round Specifications
| Manufacturer | SIG SAUER |
|---|---|
| Model | P226 XFive Nightmare |
| Part Number | 226X59NMRSAO10 |
| Caliber | 9mm Luger |
| Capacity | 10+1 Rounds |
| Barrel Length | 5 inches |
| Barrel | Bull Barrel |
| Slide | Black Nitron Stainless, Optic Ready, Serrated |
| Frame | Stainless with Beavertail and Picatinny Rail |
| Optic Footprint | SIG-LOC |
| Grips | Custom Hogue G10 Nightmare |
| Action | Single Action Only |
| UPC | 798681721610 |

Sig Sauer P226 Nightmare 10 Round Trigger and Optic Mounting
Every shot breaks the same short, clean way from the first, with no double-action press to manage. Carry it cocked with the thumb safety on, exactly as you would a 1911.
The slide is cut for the SIG-LOC footprint, so a compatible red dot mounts directly with no adapter plate and no gunsmithing.
Grips and Handling
Custom Hogue G10 Nightmare panels lock the hand in place through a long stage and hold their texture for years without softening or swelling.
A beavertail lets the hand ride as high over the bore as the design allows, and a Picatinny rail is present as well, which is unusual on a competition pistol and makes the Sig Sauer P226 Nightmare 10 Round more versatile than a pure race gun.
Compliance and Availability
Verify your own state and local capacity rules before ordering. Where standard capacity is permitted, a twenty-round version of this same pistol is cataloged separately.
MAG5 Firearms is a licensed FFL dealer in Pennsylvania. This pistol ships new in the factory case with magazines, lock and documentation, transferred through your local FFL.
Other Sig Sauer P226 Nightmare 10 Round options and compliant competition pistols are listed in our handgun catalog. Factory specifications are published by SIG SAUER.
Every Sig Sauer P226 Nightmare 10 Round sold by MAG5 Firearms ships new in the factory packaging with the accessories SIG SAUER includes, and transfers to your chosen FFL. The Sig Sauer P226 Nightmare 10 Round is a regulated firearm and we verify licensing before any order leaves the shop.
Ownership Tips
Before your first range trip, read the owner’s manual and practice loading, unloading, and field-stripping with an empty gun. Clean and lightly lubricate the pistol after each session, paying attention to the slide rails, barrel hood, and breech face, and use quality gun oil sparingly. Inspect magazines for dirt and weak springs, and replace springs on a regular schedule if you carry the gun daily.
For carry or home defense, test the ammunition you plan to rely on with at least a few boxes to confirm reliable feeding. A quality holster that covers the trigger guard, a sturdy belt, and a weapon light round out a dependable setup. Check your state and local rules on magazine capacity and transport before ordering, and we will ship to the licensed dealer of your choice.






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