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Military version of the Mark 23 that shows military slide markings.  Background shows the common heritage, American flag and German camouflage.


The HK Mark 23 Caliber .45 ACP pistol gives shooters match grade accuracy equal to that of the finest custom made handguns—yet exceeds the most stringent operational requirements ever demanded of a combat handgun.

The Mark 23 provides this accuracy without the need for hand-fitted parts common in custom-built match pistols costing thousands of dollars more.

One of the most thoroughly tested handguns in history, the MK23/Mark 23 project originated in 1991 when HK began development for the U.S. Special Operations Command, the organization that directs the activities of America’s most elite military units, including the Navy SEALs and the Army Special Forces.

On May 1, 1996, the first HK MK 23 pistols were delivered to the U.S. Special Operations Command for operational deployment, making the MK 23 the first caliber .45 ACP pistol to enter American military service since the venerable Government Model 1911A1. The slide markings differ from the commercial Mark 23 shown above in that it is engraved, "MK23 USSOCOM".

During testing, MK 23 pistols met the most stringent operational and accuracy requirements ever demanded of a combat handgun. Endurance testing demonstrated a service life of over 30,000 rounds +P ammunition. To meet the reliability requirement, the pistol had to demonstrate a minimum of 2,000 mean rounds between stoppages (MRBS) with both M1911 ball and +P ammunition. All pistols exceeded the 2000 MRBS with an average of 6000 MRBS. In more than 450 accuracy test firings from a precision firing fixture at 25 meters, MK 23 pistols far exceeded the government requirement, averaging 1.44 inches, with 65 groups of less than one inch. There were four groups of .5 inches, with 5 rounds going
through the same hole!

• threaded O-ring barrel with polygonal bore profile
• match grade trigger
• one piece machined steel slide
• frame mounted decocking lever and separate ambidextrous safety lever
• can be carried “cocked and locked” in with the safety lever on
• patented HK recoil reduction system
• corrosion resistant blued finish
• corrosion proof fiber-reinforced polymer frame
• oversized trigger guard for use with gloves
• universal mounting grooves for installing accessories
• ambidextrous magazine release lever
• extended slide release
• extractor doubles as a loaded chamber indicator
• patented Lock-Out Safety device


MK23 MOD 0 Specifications
Sight Radius
Barrel Length
.45 ACP
2.42 lb
Click images to enlarge


Copyright © 2004 Heckler & Koch Defense Inc. All Rights Reserved.