HK Mark 23 .45 ACP Threaded-Barrel DA/SA Pistol | German-Made SOCOM Design, Collectible Condition
The Heckler & Koch Mark 23 is the civilian version of the legendary USSOCOM Offensive Handgun Weapon System. Built in Germany to a 30,000-round endurance standard, this full-size .45 ACP pistol delivers match-grade accuracy, suppressor-ready features, and the robust reliability that made it a SOCOM selection. A cold hammer-forged, O-ring-sealed barrel, polygonal rifling, and HK’s proprietary recoil-reduction system set this handgun apart for shooters and collectors who demand proven performance.
Condition
Overall Condition: Excellent – shows only faint signs of prior use or handling.
Bore Condition: Excellent – clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – polygonal rifling remains crisp with no erosion.
Specific Condition Notes: Minor, superficial scratches and blemishes are present on the slide and frame; none affect function or finish depth.
What’s Included
- 2 × 12-round HK steel magazines
- HK barrel O-ring spares
- HK lockout keys
- HK Mark 23 operator’s manual
- HK factory hard plastic case
Developed under the USSOCOM OHWS program, the Mark 23 was engineered to surpass military requirements. Its 6-inch threaded barrel (M16×1 LH) pairs with high-profile adjustable sights to accommodate most .45-caliber suppressors without changing point of aim.
The cold hammer-forged barrel includes an elastomer O-ring that centers the muzzle each time the slide closes, enhancing accuracy to under 2 inches at 25 meters. Polygonal rifling supports high-pressure +P ammunition while easing maintenance.
A double-action/single-action trigger features a match-grade mechanism with an adjustable overtravel stop for a consistent, crisp break. Ambidextrous manual safeties, a decocker, and a paddle-style mag release promote confident, bilateral control.
The one-piece milled steel slide receives HK’s nitrocarburized finish for extreme corrosion resistance, while the fiber-reinforced polymer frame keeps weight manageable and integrates HK’s proprietary accessory rail.
Collectors value the Mark 23’s DE and CIP proofmarks, its Columbus GA import mark, and its continued German production—qualities that, along with its historic SOCOM lineage, make this example a standout in excellent condition.