I don't have any paper targets to post as I mostly shoot steel for practice with mine.
As for mods, I added a Tapco rubber pad to eliminate the slippery feel of the A4 stock. I replaced the A2 grip with a Hogue and replaced the stock trigger springs with reduced power springs from JP Enterprises. I replaced the stock A1 flash hider with an XM-177 style just to be different, and because I like the look.
I also mounted a Sure-Fire 3P light on the bottom along with a CAA short fore-grip. It works well after dark for critters that won't otherwise be discouraged from digging in my yard.
I have a set of Magpul BUIS installed, along with a Bushnell Trophy 1.5x-4.5x 21mm scope.