FN USA did destructive and endurance testing on handguns when they were developing the FN 509 for the US Army RFP. As usual the Glock, Sig P226 did extremely well....but....
The HK USP was the most reliable and durable handgun that they tested. It's performance was actually unbelievable and shocked FN USA.
Now before guys start chiming in on how their favourite Glock or whatever is just as good, please consider the magnitude of the FN USA test.
Millions of dollars with parameters of testing that most "experts" here on gunnutz don't have a clue about nor the technical expertise to put into action.
That's why when a Company like HK, FN (USA or Herstal), Knights, Sig Sauer, Sig Sauer AG (formally Swiss Arms) does testing it carries more weight than internet gun enthusiasts.
Now Large Range operators have some say as well. Especially places like "Battle Field Las Vegas", where very high round counts are realized. But these outfits are still not testing
to the same level or expertise as the large companies mentioned above (although Sig Sauer AG is not a large company anymore, their former expertise and testing data is immense).
Sample sizes also matter. An enthusiast owning a few guns and telling the internet world what they know is not the same as large sample sizes involving dozens, hundreds or thousands
of guns being put into Service.
Rich