Cosaint Arms COS21 Commander 2011 .45 ACP, 4.25 in Barrel, Double-Stack, Aluminum Frame, Rail, C&H Optic Plate Installed
U.S.-made Cosaint Arms COS21 Commander in .45 ACP with a 4.25 in barrel, double-stack 2011 architecture, and a 7075‑T6 aluminum hard-coat anodized frame. The slide features lightening windows and diagonal serrations, and the dust cover carries a multi-slot Picatinny rail. A C&H Precision Weapons optics-mounting plate is installed, and the pistol includes two magazines (11-round and 14-round).
Condition
Overall Condition: Fair condition, showing extensive signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: The pistol is in solid shape with scratches and blemishes present. Rust and pitting are visible on the pistol, including the barrel and inside the action. Small areas of pitting are present on the grips. The ambidextrous safety selector feels loose with a mild amount of play. Rifling is defined with some blemishes.
The optics-mounting plate is missing one screw.
What's Included
- Original case
- 1x 11-round magazine
- 1x 14-round magazine
- C&H Precision Weapons optics-mounting plate (installed)
- MBX-branded base pad on the magazine installed
This COS21 uses a 2011-style, double-stack 1911 architecture with a wide-body grip and a flared magazine well funnel for quick magazine changes. The Commander-length 4.25 in barrel and slide give this pistol a compact, carryable format while retaining full-size handling.
The frame is machined from 7075‑T6 aluminum and finished in hard-coat anodizing. Controls include an ambidextrous thumb safety, a beavertail grip safety with memory bump, and a flat-faced trigger with lightening cuts. The textured grip module has an aggressive scale pattern for consistent purchase.
The slide is cut with front and rear diagonal cocking serrations and lightening windows near the muzzle on the top and sides. It also features a lowered and flared ejection port. An optics-mounting plate cut is present with a C&H Precision Weapons plate installed. Sighting is via a front sight, and the slide is optics-ready with the installed plate; rear sight configuration may vary based on setup.
Additional details include a multi-slot Picatinny accessory rail on the dust cover, a listed capacity of 14+1, and magazines marked as noted. Frame markings include "COSAINT ARMS • EAST FLAT ROCK, NC" and "COS21," with the chamber hood marked "CAL. 45 ACP."