I have eight guns as of today and each one of them is a different make. I have three handguns, which includes a Colt 1911, a Glock 17 and a HK Mark 23. My future purchase list includes a Sig 229, Beretta M9, Ruger Mark 3, and Smith & Wesson 686. So you can see that I have no particular brand loyalty.
The MK23 is big, but that is not one of the criteria for this discussion. The question is which gun can take the most abuse and still keep shooting.
The MK23 was developed for the most elite units of the US military, so it meets the strictest standards of durability.
The internal components of the gun are oversized to make them far stronger than a normal gun. Here's a comparison with a HK USP Tactical:
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One of the main features of the barrel is the polygonal rifling. This allows greater accuracy while making the barrel much easier to clean. So the gun keeps shooting with minimal or no cleaning.
I can go on and on, but the bottom line is that this is the toughest pistol that HK has ever produced and it could probably beat any individual model of Glock, Sig or 1911 in a head to head comparison.
Glocks run polygonal rifling as well. The claim regarding accuracy is BS, accuracy is a function of the shooter not the gun. The Mk23 was selected by SOCOM, its not necessarily carried by those in the community(as in no one carries it). The torture tests were good and it proved the pistol was durable. The test did not determine in an absolute that the Mk23 is indeed the most rugged pistol. Have a look at the link earlier in this thread about the Glock 21 that was put through some rather ridiculous tests.
TDC