The Heckler & Koch Mark 23 is a double/single-action semi-automatic pistol chambered in .45 ACP. It has a 5.9-inch threaded barrel, 10+1 capacity, and weighs 2.4 lbs (38.7 oz). Finish is black. 
 

Key Specifications 

• Brand: Heckler and Koch 
• Model Name: Mark 23 
• Caliber: .45 ACP 
• Action: Semi-Automatic (Double/Single Action) 
• Capacity: 10+1 rounds 
• Barrel Length: 5.9 inches 
• Weight: 2.4 lbs (38.7 oz) 
• Finish: Black 
   

Detailed Features 

The Mark 23 was originally developed for the U.S. Special Operations Command (USSOCOM) offensive handgun program. The threaded barrel accepts suppressors and other muzzle devices. Ambidextrous safety and magazine release accommodate left- and right-handed users. The 3-dot sight system is straightforward for rapid target acquisition. 
 
The polymer frame keeps weight manageable for a full-size .45. The DA/SA action allows the first shot from a decocked position in double-action, with subsequent shots in single-action. At 5.9 inches of barrel, velocity is maximized for .45 ACP loads.

The Mark 23 draws genuine respect from serious shooters who know its SOCOM origin. Its accuracy, particularly at longer pistol distances, is consistently praised. The DA/SA trigger and ergonomics get good marks for handling during extended sessions.

The size and weight come up in almost every discussion. At 38.7 oz with a 5.9-inch barrel, it is large for everyday carry, and most users treat it as a range or duty pistol rather than a carry gun. Beginners also tend to find the platform complex relative to simpler striker-fired options.

Debates surface about whether it's better suited for tactical duty use or recreational range shooting. Aftermarket support exists but most owners prefer keeping it original. The HK brand reputation holds up across most reviews.