Any trigger upgrade over a stock trigger is a definite improvement, regardless if you are talking about a DI or Gas gun. I have a Giessele 2-stage in one lower, and a RRA match trigger (2-stage) in another. I cannot detect any difference in feel or performance between the two, but the Giessele has the better reputation as being bullet proof and is what I would put in a battle rifle. For economy, the RRA match trigger is hard to beat. Most stock AR triggers feel like a box of rocks compared to the upgraded triggers I have used. I never really noticed the difference in triggers until I started shooting long range stuff (NRA High Power Rifle), I can tell you a good trigger makes a world of difference and is the first upgrade one should think about to improve accuracy!!!