Right now, single shot AR builds do not exist, even though you can craft weapons for it, like attaching a basic scope and a bipod to an assault rifle to increase the precision of single shots by 16%, basically crafting a dedicated "single shot AR", except... there is no reason to do so or anything to support the playstyle.
Now check out this feat idea:
Perfect Shots - if your uncapped accuracy to the target is 125% or higher, you do maximum damage in your damage spread with single shots from your AR/SMG
Well now, suddenly the 9mm Huszar is a lot more interesting, using a basic scope and/or bipod enhancement is a lot more interesting, Adaptive goggles, interacting with low-light and other accuracy penalties in an AR build. Maybe NPCs could use it so they wouldn't look so foolish when they spend a whole turn firing single shots from an AR.