While there have always been exceptions, historically there has been no group of more conservative, hidebound, resistant to change, and supremely convinced of their own infallibility, officers than those in military ordnance bureaucracy. And not just in the US.
Not sure if it is because of the kind of people that gravitate into those positions, or the "system" creating and fostering that kind of thinking. Probably some of both.
History is full of instances where the dogmatic mindset of the Ordnance "professionals" prevented the adoption of mechanically superior designs, (which WOULD have given tactical superiority as well), because of some arbitrary standard.
History also gives us many examples of the same mindset preventing, or delaying the repair/correction of something they had blessed, but did NOT WORK PROPERLY. One of the more recent ones is the (now) famous "torpedo troubles" during WWII.
There is one basic fallacy about a comparison between "modern fighting men" and old west cowboys & gunslingers, and that is that the cowboys and gunslingers were not "fighting men". Yes, they fought, individuals, and groups, but they were not "fighting men" like a military unit.
one could turn it around and say LAPD (traffic, NOT SWAT) vs old west gunslingers. While also not a totally fair comparison, it is a bit closer, IMHO.
and I have read the John Ringo books, I do like them immensely.