TweetThe Mark 23, USP Elite, and USP Expert are the top of the line for HK. However, the USP is the basic model of those guns and thus would be considered the best among many. Even the Mark 23 is a USP with modifications for experts level shooters. But the newer models they make are fast becoming favorites among many, namely the P30 and HK45. The HK45 was developed as a product improvement of USP45. All of their guns are excellent firearms and offer exceptional accuracy and reliability. I have never had a single failure on my USP and have shot several types of ammo through it.
Here is a description of the Mark 23 taken from HK's website.
Mark 23
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.
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 of +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!