SIG Sauer P211 Custom Works GTO Equinox 9mm, 4.4 in Bull Barrel w/ Mach3D Compensator, 21+1, Nitron/Polished Stainless Two-Tone
The P211 Custom Works GTO Equinox is a 2025-release, double-stack 1911-pattern 9mm from SIG Sauer Custom Works. It features the Equinox two-tone treatment, a factory 4.4 in bull barrel with Mach3D compensator, and a full-length dust cover with an integral 3-slot accessory rail. This SAO pistol ships with three 21-round steel magazines and includes a factory test target documenting a 0.39 in 3-shot group at 15 meters.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor scratches and blemishes are present. There is visible carbon buildup in the compensator.
What's Included
- 3x 21-round steel double-stack magazines
- SIG Custom Works Negrini lockable hard case (foam-fitted)
- SIG Sauer operator's manual
- Custom Works Certified Custom card
- Factory test target
- SIG Custom Works challenge coin
- Spare recoil springs (black and yellow)
Built on the P211 platform announced in June 2025, this Custom Works GTO Equinox pairs a stainless steel frame with a black Nitron finish and a two-tone slide with polished stainless flats. The full-length dust cover incorporates a 3-slot accessory rail, and the squared muzzle block complements the compensated bull barrel setup.
The slide includes front and rear cocking serrations, decorative milling at the rear flats, and the signature Equinox contrast of black Nitron with polished flats. Sights are a green fiber-optic front and a black serrated square-notch rear for a clean, high-contrast sight picture.
Controls are SAO with ambidextrous thumb safeties and a beavertail grip safety. The fire-control suite includes a skeletonized commander-style hammer and a skeletonized three-hole curved trigger. Textured black grip panels feature GTO inlays, and the double-stack design yields a 21+1 capacity.
Approximate factory dimensions are an OAL of ~8.5 in, a height of ~5.25 in, a width of ~1.5 in, and a weight of ~46 oz. The included factory test target (Model 211, SKU 211F-9-GTO-EQ) documents a 0.39 in 3-shot group at 15 meters using Speer Gold Dot 147 gr on 11/20/2025.