If you find the rear sight to be very tiny and hard to see, there's a fixed sight replacement which is actually pretty well done.
I put it on mine. (To be fair, mine is a 9x18 Bulgarian for which I purchased a commercial Russian slide to refinish and "upgrade" on a wild hair.)
Also, that FAB defense grip with the black lever at the top? Drop free magazine release. Comes in colors other than FDE, but helps update the platform a bit.
My .380 slide came with a .380 barrel to make it easier to convert if/when 9x18 becomes harder/impossible to get.