1-4x LPVOs with target reticles and exposed turrets don’t make much sense outside of service rifle competition. An ACOG with a piggyback red dot is a far “better” system than most any SR oriented optic even if you won’t score as high. There are some decently functional 1-4 variables like the TR24 but they suffer the same “flaws” as the ACOG from an SR match perspective. Buy an optic you can enjoy on its own merits, regardless of match scores. The “Service rifle” competition scopes are somewhere between neutered bastardizations of proper DMR optics and bulkier alternatives to combat oriented prism or variable scopes. You’ll be much happier with a combat oriented LPVO, even if it puts you in the “match rifle” category with higher magnification, or an ACOG. If you’re not interested in piggybacking a red dot on the ACOG, the former are worth considering. Chevron reticle all the way if you are going for an ACOG.
I say all this having participated in many SR matches, most of them with iron sights on a Rock River NMA2. I’m currently in the process of turning that rifle into a more conventional M16A2 analog because the match features are an annoyance. I may shoot lower scores once it’s finished, but it will be a more enjoyable weapon to own. I have also used my 16” midlength “fighting rifle” with the ACOG in some matches with no sling support or jacket, with predictably low scores, but I had a lot of fun doing it.
I speak from experience when I allege that creating a “weapon system” around a specific style of competition can leave you feeling unsatisfied with its general characteristics. Put together whatever you think will give you the greatest enjoyment, and take the match scores as they come. No matter your place on the scoreboard or equipment, your marksmanship skills should improve at a reasonable rate with each match you shoot, and that’s ultimately what’s important.