Fitting required as expected for any such sights; do not undertake unless you know how! Factory sights had point of impact 6" low from point of aim at 20yards- This Trijicon set ( on my p226 "tacops" ) brought them into proper agreement. These are what SIG should have used in the first place! Recommend.
Pros: Installs with fitting typical for sights, correct point of aim/ impact agree
Cons: what Sig should have done to begin with
This review was written in the old system and had content requirements that are different than reviews written today.