RE: upgrading a M93 Mauser, yes or no
I'd leave it as is..They won't be making any more of them..If you want a peep, there is a sight on the market called a Mojo Sight ...It replaces the issue rear sight with no permanent modification of the firearm..You can install it and then return the rifle to it's original condition by simply removing it and re-installing the issue sight...I have one on a M48A Yugo Mauser and it works very well..
The M93 is not as strong an action as the later M98..It should be perfectly safe with factory loads or handloads in the same pressure levels as factory loads...