The Sig Sauer P226 X-Five Nightmare is a full-size, single-action-only 9mm pistol built on the X-Five competition platform. It has a 5-inch bull barrel and a stainless steel frame finished in black Nitron, with an optic-ready slide that uses the SIG-LOC interface and an integrated magwell. The pistol ships with 20-round magazines for extended capacity. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P226 X-Five Nightmare 
• Caliber: 9mm Luger 
• Action: Single Action 
• Capacity: 20+1 
• Barrel Length: 5 in 
• Finish: Nitron 
• Frame Material: Stainless Steel 
   

Detailed Features 

• Optic-ready SIG-LOC slide interface for red dot mounting 
• Fiber optic front sight for fast target acquisition 
• Custom G10 grip panels for a secure hold 
• Extended beavertail, serrated slide and frame, and an integrated magwell for faster reloads 
• 1913 Picatinny accessory rail on the dust cover for lights or lasers

Owners of the P226 X-Five line generally rate build quality high, pointing to the fit of the slide to frame and the smoothness of the SAO trigger out of the box. The bull barrel and heavier competition profile are frequently mentioned as contributors to a stable feel in the hand.

Ergonomics draw mixed reactions. The G10 grips and extended beavertail fit most hands well and help with recoil control, though some shooters with smaller hands find the X-Five's grip circumference large for concealed or all-day carry. The optic-ready slide is popular with owners who want to add a red dot without sending the gun out for milling.

On value, buyers generally see the Nightmare as a premium P226 variant and price it accordingly. Aftermarket parts and gunsmith support for the X-Five platform are considered solid, and owners who compete note that the design holds up well to repeated use at the range.