Wow, you'll get all kinds of recommendations on this.
If its a defensive gun, I would suggest fixed sights.
Some guys like only the front sight tritium. some like 2 different colors for front and rear
I like Heinie straight eight slant pros but also have XS sight systems big dot on a G23
Novaks are good
Trijicon are on my Kahr
some of the light gathering sights get pretty good writeups.
I haven't been on this site too much in the past 7 months or so but did you do a search on sights? I'll bet you pull up dozens of threads with writeups and links.
Hoping someone had some used ones for sale. In the last 2 years shot around 6000 WWB out of the G19 and another 4000 out of G27,17,22, Keltec P-3AT,P11,SW 6906,SW 36, XD9,SA 1911, Kahr K40. Had 38 Hand guns down to 7, 2 Keltecs, SW 36,6906,G19,G27,P22. Mainly thinking of the G27, can't give up the bigger bullet than 9, ordered a LW conversion to 9, have a CTC, want front night sight have 07 set for SD, rear sight for range have a new adjustable but then have rear night in safe, have alot of mags, 33rds, G22, G23, G17, AR for trade would like a couple more G26. Shot enough I don't think I see the rear sight as much, out door range, shoot in all weather, alot of brass to sell, find alot at the range. Normally shot 150 rounds once a week, down to 12,000 rds going to sell alot of 223's, going to sell 2 of 3 AR's and one of two AK, built two tactical 10/22, gave up my FFL, Have CCW, turning my guns into ammo, getting ready for a new pres.
Just want to go to the range twice a week shot 400 rds of 22,380,9,38,40,20,12 and the anti-gunner to leave me alone