Okay so I have an M&P "1.0" full size 9 mm and I just purchased a brand new M&P 2.0 compact .40 3.6". I love both of these guns but I want to do a little upgrading. On the M&P 9mm full size the old night sights are done. They have no more life in them at all. So I'd like to replace them with something but I'm not sure what would be the best type or the best brand. I have been looking at fiber optic, maybe green on the front and red on the rear. I'm almost 62 years and my eyes aren't as sharp as they used to be so I'm getting new glasses but I want sights that are good for old eyes. Something I can get on quickly and that give a sharp, clear sight picture in different kinds of light. Also do all M&P sights interchange? Shield, 1.0, 2.0, compact and full size?