Heckler & Koch HK Mark 23 .45 ACP, Full-Size DA/SA, Threaded 5.87 in Barrel, ODG Polymer Frame, Suppressor-Height Sights
This German-made HK Mark 23 stands out with its factory-threaded 5.87 in match-grade barrel featuring an O-ring lockup and polygonal rifling, a proprietary HK LAM interface rail, and suppressor-height iron sights. It is DA/SA with a frame-mounted safety/decocker and includes matching serials on the slide, frame, and factory case label. DE and CIP nitro proofs and the HKI Columbus, GA import mark confirm provenance. This H&K Mark 23 features a threaded barrel.
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 - Polygonal rifling is clean and well-defined.
Specific Condition Notes: The firearm presents in excellent condition, and the bore is bright and clean.
What’s Included
- HK factory hard case labeled 'PISTOL MK23 .45'
- HK Mark 23 operator's manual
- Safariland duty holster molded for HK Mark 23
- Four 12-round steel magazines
The Mark 23 is a full-size .45 ACP built for hard use and suppressed applications. Its factory-threaded, extended 5.87 in barrel is match-grade, with an O-ring lockup that enhances consistency. Polygonal rifling supports a clean, efficient bore profile. Suppressor-height iron sights provide a clear sight picture when used with muzzle devices.
The pistol operates in DA/SA with a hammer-fired, recoil-operated system. Controls include a paddle-style magazine release and a frame-mounted safety/decocker for confident handling. Capacity is 12+1, and four steel magazines are included.
The polymer frame wears an olive drab green finish with aggressive molded texturing and a lanyard provision. The slide carries a matte black finish. Up front is the proprietary HK LAM interface rail (non-Picatinny), purpose-built for the Mark 23's intended accessories of its era.
Proofs and markings include DE country code and CIP N nitro proof, along with the HKI Columbus, GA import mark. This example has matching serial numbers on the slide, frame, and factory case label, aligning the pistol and its case as a set.