The Heckler & Koch Mark 23 is a .45 ACP single-action semi-automatic pistol with a 5.9-inch barrel, 12-round capacity, and a polymer frame with steel slide, both in black. Night sights -- 1-dot front, 2-dot rear -- are fitted as standard. The pistol weighs 2.46 lbs (39.36 oz) and is 10.4 inches overall. It was developed as the SOCOM Offensive Handgun Weapon System and has an integral accessory rail under the barrel. 
 

Key Specifications 

• Manufacturer: Heckler & Koch 
• Model: Mark 23 
• Caliber: .45 ACP 
• Barrel Length: 5.9 inches 
• Capacity: 12 rounds 
• Weight: 2.46 lbs (39.36 oz) 
• Action Type: Single action 
• Frame Material: Polymer with black finish 
• Slide Material: Steel with black finish 
• Grip Material: Textured black polymer 
• Safety Features: Thumb safety included 
   

Features 

 
The 5.9-inch barrel contributes to muzzle velocity and accuracy at distance. The 12-round magazine in .45 ACP is more than typical for this caliber in a single-stack or comparable design. Night sights suit low-light use. The textured polymer grip maintains control across firing conditions. The integral accessory rail accommodates lights and suppressors, which was part of the original military requirement. 
 

Usage 

 
The Mark 23 is suited for range use, collecting, and duty applications where its size is not a limiting factor. The .45 ACP caliber and 12-round capacity are strong for a defensive or tactical role. Carrying the Mark 23 concealed daily is impractical given its dimensions and weight. Its association with USSOCOM use is part of its collector appeal.

The H&K Mark 23 Tactical .45 ACP draws consistent admiration for build quality and precision. Owners report it as one of the most accurate .45 ACP pistols they have used, and the materials are described as clearly durable.

Size and weight are the most debated characteristics. Those who value the added mass for stability and recoil management during shooting view it positively. Those who want versatility for carry find the dimensions limiting. Recoil in .45 ACP is described as manageable given the pistol's weight.

The accessory rail and suppressor-host capability are functional highlights for tactical users. Price is high relative to most .45 ACP pistols, which generates discussion -- many owners feel it is worth the cost, while some question it against alternatives. Historical association with special operations use adds appeal for collectors. Customization options through aftermarket sights and grips are available and discussed among owners.