After doing a good dozen of these over the years, my advice would be to buy the sear (only) and do it yourself. All you really need to do it yourself is a set of $15 punches which is way less than most shops charge fr am install.. By doing it yourself, you'll not only save money but you'll also learn how the internals of your firearm work. Lastly, you'll be able to polish the important internals (with a little Mothers Mag polish) and get the trigger even better than you'd get with a drop in install.