Anyone have a good recommendation for an easy to install aftermarket AR trigger?

Put a Timney on a model 700 and m77 MkII,but never messed with triggers for semi auto.

Guess if there are aftermarket AR triggers that are easy like the Remington model 700 triggers than I would probably be very interested in something along those lines.

Having trouble getting my 450 bushmaster upper to shoot like I want it to. Nothing wrong wit the upper at all. Just know the "nut" behind the bolt is used to a lighter trigger....