The MK23 gives shooters absolute match grade accuracy - yet they exceed 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.

The frame mounted de-cocking lever, separate from the ambidextrous safety lever, allows the hammer to be lowered safely and quietly. When the hammer is down, the ambidextrous frame mounted safety lever is locked in fire position so that the pistol is always ready for Single Action operation.

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 unit that directs the activities of America’s most elite military units, including the NAVY SEALS and the Army Special Forces. Following stringent comparative trials, on May 1st, 1996 the Mk23 was adopted as a service pistol under the designation MK23 MOD.O -- the first caliber .45 ACP pistol to enter American military service since the venerable Government Model 1911A1.

During testing, the USP had to meet the most stringent operational and accuracy requirements ever demanded of a combat handgun. Endurance testing demonstrated a service life of over 30,000 rounds of + P ammunition. To meet the reliability requirement, the pistol had to demonstrate a minimum of 2000 mean rounds between stoppage (MRBS). All pistols in the test exceeded the 2000 MRBS with an average of 6000 rounds. Furthermore, in more than 450 accuracy test firings from a precision firing fixture, MK23 pistols far exceeded the US Government requirement, averaging under 37 mm.

Among others the following tests had to be passed successfully:

• 30,000 round endurance firing test with + P ammunition
• Extreme temperatures +73°C/-54°C
• 96 hours saline mist test
• Sand, dust and sludge tests
• 96 hour surf simulation
• Harshest drop tests
• Accuracy and the highest precision