Not really familiar with the RIA line. A friend of mine just bought one with the 3.5" barrel. Haven't seen the gun, just pictures. Looks like the tiny sights on his as well. I'll probably have to help him sort it out, so I'll become a little more familiar with the pistol. Based on the pictures, I'd replace the sights first thing, they appear to be too small to be very practical. I'm sure the rear sight is in a dovetail, so replacing that one will be easy enough. Not sure about the front sight, is it dovetailed, staked, or an integral part of the slide? If it's staked or dovetailed, you're home free!
Savage