SIG Sauer P211 GTO 9mm SAO, 4.0 in Bull Barrel with Mach3D Compensator, 21+1, Nitron Finish, SIG-LOC PRO Optic Cut, P320 Mag Compatible, 7x 21-Rd Mags
This full-size SIG Sauer P211 GTO stands out with a factory 4.0 in bull barrel paired to a Mach3D 3D-printed compensator, a Nitron-finished steel frame and slide, and a high-capacity 21+1 magazine system that uses SIG P320 double-column magazines. The slide features a SIG-LOC PRO footprint optic cut with the cover plate installed, while the alloy grip module adds aggressive texture, GTO branding, and an oversized magazine well funnel. A factory straight-pull SAO trigger rated at approximately 3.5–4 lb and a factory test target dated November 18, 2025 round out a feature set designed for fast, confident shooting.
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: This pistol shows little sign of prior use, and its function is excellent based on inspection.
What’s Included
- SIG Sauer factory hard case
- SIG Sauer operator's manual access card (QR code)
- Cable lock
- Factory test target (matching serial)
- 7x 21-round P320-pattern double-stack magazines
The compensated 4.0 in bull barrel and factory Mach3D 3D-printed compensator are the core of this GTO package, delivering a tuned gas redirection setup straight from SIG. The full-length dust cover adds mass up front and integrates a 3-slot Picatinny rail for mounting lights or other accessories as needed.
The slide is Nitron finished and cut for optics using the SIG-LOC PRO footprint; a cover plate is installed. It carries front and rear cocking serrations plus top serrations/lightening cuts for enhanced purchase and balanced reciprocating mass.
The grip module is an alloy design with aggressive texturing and prominent GTO branding, paired with Hogue G10 grip panels and an oversized magazine well funnel to speed reloads. This model accepts SIG P320 double-column magazines and ships with seven 21-round mags to take full advantage of its 21+1 capacity.
Controls and internals reflect a focused SAO build: a straight-pull, skeletonized trigger rated at approximately 3.5–4 lb, a skeletonized hammer, and comprehensive safety features including a grip safety, ambidextrous manual thumb safeties, and a firing pin safety. Fiber-optic front (green rod) and a plain black rear notch provide a crisp sight picture.