I’ve used a Harris for 3 seasons with good results then tried an Atlas for a couple matches but didn’t really like it except for the 45deg folding legs. So I ended up getting the Evolution bipod it’s basically the best of both the Atlas and Harris
For the money it's hard to beat a Hornady LNL single stage classic kit for $340 and 500 free bullets.
actually Natchez has the kit on sale for around $250 right now
I ran a 2.5-10x scope on my 16" 3 gun AR for 2 seasons and we shot from 3 feet to 550 yards. Although it was tuff to shoot close targets quickly with 2.5x it was doable and the 10x was great at distance.