What @mingaa said... Find out what you do and do not like on a gun after shooting it for awhile. Then make those changes. If you can not figure out what changes to make for it to work for you then you would be asking the right questions. Also some times you have to adapt to a firearm and not the other way.Make changes when you know what you need and why.
Different guns/different people/diffident goals.
Never make a change for the sake of making a change!
The 930 tactical has useless sights as is.
Go to the Meprolight night sight...Every Moss I own has oneI guess I'm not a fan of the tiny bead sight lol