Want to upgrade to adjustable sights on my Sig 938. Suggestions ?

Why adjustable? Do you intend to alternate widely between bullet weights and powder loads for long range shooting with it?

Yeah that's it. I've been trying to shoot beer cans off of peoples heads at 100 yards , I'm running out of volunteer target holders..

If it's just because, go for it, but the 938 is a little package and most aftermarket adjustable sights will spoil the lines.

If it's a bullet strike issue, you can easily tweak the sights you have and get it centered with your choice of ammo.