SIG Sauer P226 X-Five Nightmare – 9mm, 5" Bull Barrel, SAO Custom Works (226X5-9-NMR-SAO)
The P226 X-Five Nightmare is SIG Custom Works’ full-size, all-metal competition pistol: a Nitron XSeries SIG-LOC PRO optic-ready slide, a 5-inch bull barrel, a stainless steel frame, and a fully adjustable AX3 single-action flat trigger. Ship weight lands at 46.6 oz with magazine, and it comes with three 20-round steel magazines. SIG Sauer part number 226X5-9-NMR-SAO, UPC 798681721603.
This listing is for the P226 X-Five Nightmare 9mm SAO (226X5-9-NMR-SAO) only.
Steel Frame, SAO AX3 Trigger
This is a single-action-only P226 built around SIG’s AX3 adjustable flat trigger. The stainless steel frame with Nitron finish and a 1913 accessory rail put mass where it helps — under recoil — while the custom Hogue G10 Nightmare grip panels with an integrated magwell lock your hands in for fast strings.
SIG-LOC PRO Optic Ready
The XSeries slide is cut for SIG-LOC PRO direct optic mounting. Irons are a fiber optic front and a removable adjustable target rear — pull the rear plate when you’re ready to mount a compatible red dot. Controls include E-Nickel trigger and hardware plus an improved XSeries extended slide catch, and the pistol includes a manual safety.
SIG Sauer P226 X-Five Nightmare Specifications
| Manufacturer | SIG Sauer / Custom Works |
| Model | P226 X-Five Nightmare |
| Part Number | 226X5-9-NMR-SAO |
| UPC | 798681721603 |
| Caliber | 9mm Luger |
| Action | Single Action Only (SAO) |
| Trigger | AX3 fully adjustable flat trigger |
| Barrel | 5" bull barrel |
| Capacity | 20+1 |
| Magazines Included | (3) 20-round steel magazines |
| Frame | Stainless steel, Nitron finish, 1913 rail |
| Slide | Nitron XSeries, SIG-LOC PRO optic ready |
| Optic Footprint | SIG-LOC PRO |
| Sights | Fiber optic front / adjustable target rear (removable) |
| Grips | Hogue G10 Nightmare with integrated magwell |
| Overall Length | 8.6" |
| Height | 5.9" |
| Width | 1.8" |
| Sight Radius | 6.8" |
| Weight | 46.6 oz with magazine |
| Manual Safety | Yes |
Frequently Asked Questions
Is this single-action only?
Yes. The Nightmare uses SIG’s SAO AX3 flat trigger system — not a DA/SA P226.
Does it come with magazines?
SIG lists three 20-round steel magazines with alloy basepads (10-round magazines where capacity is restricted).
What optic footprint is it?
SIG-LOC PRO. Compatible optics mount after removing the adjustable rear sight plate.
Is this the Custom Works Nightmare SKU?
Yes — part 226X5-9-NMR-SAO, UPC 798681721603. This listing is that configuration only.
Internal Reference:
226X5-9-NMR-SAO
Barcode:
798681721603
| Brand: Sig Sauer |
| Model: P226, P226 X5 |
| Caliber: 9mm |
| Firearm Action: Semi-auto |
| Color: Black |
| Barrel Length: 5", 5" - 6" |
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This item cannot be shipped to the following locations due to legal or carrier restrictions:
Restriction Details
This product cannot be sold or shipped to your location due to magazine capacity restrictions. Magazine capacity cannot exceed 10rd. If you believe this to be incorrect or if you're exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (10):
Restriction Details
Colorado prohibits magazines with a capacity exceeding 15rd. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (1):
Restriction Details
Vermont restricts handgun magazine capacity to 15rd. This exceeds the state's restricted capacity. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.
Vermont restricts rifle magazine capacity to 10rd. This exceeds the state's restricted capacity. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.