Heckler & Koch Mark 23 .45 ACP, 2002 German Ulm-Proofed, Threaded 5.87 in Barrel, DA/SA, Polygonal Bore, 2x 10-Round Mags
This German-made Mark 23 stands out as a commercial Ulm-proofed example with an AC (2002) date code and matching serial markings on the slide and the frame metal tag. It features the model’s extended, cold hammer-forged barrel with factory M16x1 RH threads and an O-ring for tight lockup, high-profile adjustable sights, and an ambidextrous paddle magazine release. Two 10-round magazines are included, along with a knurled thread protector and a rail-mounted clamp/adapter with a forward lens installed.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good - Clean, well-defined polygonal bore surfaces.
Specific Condition Notes: This firearm is in great shape. There are some minor and superficial scratches and blemishes present. The bore presents a bright interior.
What’s Included
- Heckler & Koch Mark 23 .45 ACP pistol
- Two 10-round steel magazines with numbered witness holes and polymer floorplates (one marked 'Made in Germany')
- Knurled thread protector (installed)
- Rail-mounted clamp/adapter with forward lens (installed)
The Mark 23 originates from the OHWS program lineage and carries hallmark features tailored for durability and precision. Its 5.87 in extended barrel is cold hammer-forged with polygonal rifling and a replaceable O-ring at the muzzle to support consistent lockup. The factory M16x1 RH threading pairs with the included knurled thread protector.
The DA/SA, short-recoil, linkless Browning action is paired with a manual safety and a decocking lever for controlled operation. An ambidextrous paddle-style magazine release supports easy actuation from either side of the trigger guard.
High-profile iron sights, adjustable for windage and elevation, deliver a long 7.76 in sight radius. The raised blade front and adjustable rear provide a clear sight picture suited to the pistol’s full-size format.
The fiber-reinforced polymer frame has a coarse-stippled grip for traction and incorporates the Mark 23’s proprietary universal accessory grooves. The slide features rear serrations, an external extractor, and a faceted profile. This example bears German Ulm proof marks (Bundesadler over N and the Ulm stag antler), the AC date code (2002), and HK, Inc., Sterling, VA import markings, along with Made in Germany frame text.