Description
The Sig Sauer P226 Nightmare 20 Round carries more ammunition than any other pistol SIG builds on this frame, behind a five-inch bull barrel and a single-action trigger. MAG5 Firearms stocks this XFive Nightmare with Hogue G10 Nightmare grips, an optic-cut slide and an all-steel frame.
Twenty Rounds and a Bull Barrel
The magazine is the headline. Twenty rounds in a P226-pattern gun means fewer reloads in a match and fewer magazine changes in a long practice string, and the Sig Sauer P226 Nightmare 20 Round uses factory magazines rather than aftermarket extensions.
The bull barrel puts mass forward where it damps muzzle rise. Combined with the steel frame, this pistol tracks flat enough that the sights or the dot barely leave the target between shots.
Sig Sauer P226 Nightmare 20 Round Single Action Trigger
There is no double-action first press to manage. Every shot breaks the same short, clean way, which is the single largest factor in shooting a hammer-fired pistol quickly and consistently.
Carry it cocked with the thumb safety engaged, exactly as you would a 1911. Shooters coming from that platform need to relearn nothing.
Sig Sauer P226 Nightmare 20 Round Specifications
| Manufacturer | SIG SAUER |
|---|---|
| Model | P226 XFive Nightmare |
| Part Number | 226X59NMRSAO |
| Caliber | 9mm Luger |
| Capacity | 20+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 | 798681721603 |

Grips, Optic Cut and Setup
Custom Hogue G10 Nightmare panels are cut aggressively enough to lock the hand in place through a long stage, and G10 holds that texture through years of use without softening.
The slide is cut for the SIG-LOC footprint, so a compatible red dot mounts directly with no plate. On a five-inch sight radius the dot removes the last variable between shooter and target.
Competition and Range Use
Five-inch barrel, steel frame, single action and an optic cut cover several competition divisions depending on the ruleset, and the twenty-round magazine helps wherever capacity is not restricted.
The Sig Sauer P226 Nightmare 20 Round is equally at home as a range gun for someone who simply wants the flattest-shooting 9mm on the line rather than a match score.
Availability and Transfer
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.
A ten-round version of this same pistol is cataloged separately for capacity-restricted states.
Other Sig Sauer P226 Nightmare 20 Round configurations and competition pistols are listed in our handgun catalog. Factory specifications are published by SIG SAUER.
Every Sig Sauer P226 Nightmare 20 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 20 Round is a regulated firearm and we verify licensing before any order leaves the shop.






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