I know it's not what you want to hear, but the problem is not your sights, it's you. Changing the sights will only be a band-aid and not solve the real issue.
In my opinion there is no reason to put adjustable sights on a compact pistol.
If you want a Glock in.40 with adjustable sights, that will help you group better @ 25 yards, get a Glock 35.
Now, should you ignore this and go shopping for adjustable sights any way....
Check out Dawson Precision, they have some adjustable sights:
DP Rear Sight Glock Black Serrated Adjustable Rear Sight, .125" Notch, Match with .285 or .300 Tall Front #017012 Detail Page
DP Rear Sight Glock Black Serrated Adjustable Rear Sight, Standard Notch, Match with .335 Tall Front #024026 Detail Page