SIG SAUER P211 GTO 9mm SAO, 4.4 in Bull Barrel with Mach3D Compensator, Optic-Cut Slide, 21+1 Capacity, Alloy Grip Module
The SIG SAUER P211 GTO is a recent U.S.-made, double-stack 9mm built on a 1911-style SAO platform. It pairs a 4.4 in bull barrel with a Mach3D compensator and an optics-cut slide, and it accepts 2011/P211-pattern double-stack magazines for a stated 21+1 capacity. This example includes two 21-round and one 23-round magazines and ships in the factory SIG case with paperwork.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Specific Condition Notes: Mild cosmetic wear and light carbon buildup are present from prior firing and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
What’s Included
- SIG SAUER factory hard case
- Paperwork
- Two 21-round and one 23-round steel double-stack magazines (2011/P211 pattern)
- Dawson Precision spare green fiber-optic rod for the front sight
The P211 GTO is configured as a SAO double-stack 9mm with ambidextrous thumb safeties and a beavertail grip safety. The aggressive-textured alloy grip module integrates an oversized, flared magwell; factory dimensions list width at 1.6 in with the magwell installed. A straight-pull, skeletonized trigger and a skeletonized commander-style hammer complete the fire-control setup.
The slide features front and rear serrations, a long dustcover, and an optic cut. As configured, the rear sight/plate is not installed. A green fiber-optic front sight is installed, and a spare green fiber-optic rod is included.
Barrel and recoil system are centered around a 4.4 in bull barrel capped with SIG’s Mach3D compensator; the slide nose is relieved around the compensator. The long dustcover carries a 3-slot accessory rail for lights or accessories as desired.
The pistol accepts 2011/P211-pattern 9mm double-stack magazines and has a stated maximum capacity of 21+1. Factory specs indicate an overall length of 8.5 in, a height of 6.4 in, and a weight of 45.4 oz with magazine.
Manufactured in Newington, New Hampshire, this variant is identified by part number 211F-9-GTO. The factory case label confirms the GTO configuration and matches the pistol.

