H&K Mark 23 | .45 ACP | 5.87″ Barrel | 81000080

The Heckler & Koch Mark 23 is a large-frame .45 ACP semi-automatic pistol built to deliver match-grade accuracy and robust operational durability. This variant features a threaded O-ring polygonal barrel and a one-piece machined steel slide paired with a corrosion-resistant finish and a polymer frame. It ships with two 10-round magazines and a serrated slide for positive manipulation. For an optic under $1,000 that pairs well with this platform consider a Trijicon RMR Type 2 for fast target acquisition on a full-size pistol.

Product Specifications

• The manufacturer is Heckler & Koch / H&K.
• The model is the Mark 23.
• The manufacturer part number is 81000080.
• The UPC is 642230261228.
• The caliber is .45 ACP.
• The barrel measures 5.87 inches and is threaded.
• The barrel profile is a threaded O-ring barrel with polygonal bore.
• The slide is a one-piece machined steel slide with serrations for grip.
• The frame is a polymer frame finished in black.
• The finish is listed as a corrosion-resistant blued/black finish.
• The sights are fixed 3-dot contrast sights.
• The firearm includes two 10‑round magazines.
• The overall length is 9.65 inches.
• Controls include a frame-mounted decocker, ambidextrous safety lever, and ambidextrous magazine release.
• The thread pattern for accessories is 16x1mm RH.

The Mark 23 is designed for shooters who need a full-size, precision-capable pistol with proven durability. Its threaded polygonal barrel and robust slide/frame combination make it suitable for precision target work and duty/service applications where consistency and controllability are priorities. The included magazines and accessory thread make it straightforward to set up for range use or for optics and suppressor-capable configurations.