Cosaint Arms COS21 Commander 9mm Double-Stack 1911, 4.25 in Ported Bull Barrel, Optics Cut, 19+1
This Cosaint Arms COS21 Commander is a double-stack, modular 1911-pattern pistol in 9mm Luger with a Commander-length 4.25 inch bushingless bull barrel featuring a single top port. It builds on a 7075 aluminum receiver paired with a PA-12 polymer grip module and an integrated flared magwell. The slide is optics-cut with a removable plate that retains the rear sight and includes lightening windows at the muzzle. It offers a 19+1 capacity, ambidextrous controls, fiber-optic green front and ledge-style rear sights, and a three-slot accessory rail. Manufacturer markings indicate East Flat Rock, North Carolina production.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Fair Rifling - Worn rifling, slight loss of definition.
Specific Condition Notes: The pistol's action is smooth and glassy. The feed ramp is clean and shiny. The rifling is blemished throughout. The grip was stippled for added grip.
What's Included
- Cosaint Arms factory hard case
- Cosaint Arms owner note letter
- 1x 19-round MBX 9mm magazine (base pad marked MBX)
- 1x 10-round MBX 9mm magazine (base pad marked MBX; one magazine body marked "MBX 9mm")
The COS21 platform is a modular, double-stack 1911 design. It uses a 7075 aluminum receiver with a PA-12 polymer grip module and an aggressively textured grip featuring CA medallions. A flared one-piece magazine well funnel speeds reloads.
The Commander-length 4.25 inch barrel is a bushingless bull profile with a single top port. The slide adds lightening windows near the muzzle and an optics cut with a removable plate that integrates the rear sight.
Controls include an ambidextrous thumb safety and a beavertail grip safety with a memory bump. The single-action, hammer-fired system uses a skeletonized rowel hammer and a skeletonized, lightened trigger tuned to approximately 3.5 pounds.
Target-focused sights include a green fiber-optic front and a serrated ledge-style rear. The dust-cover accessory rail features three slots for mounting compatible lights or accessories. Capacity is 19+1 with the included double-stack magazines. Country of origin is the United States, with production marked in East Flat Rock, North Carolina.