There are allot of different things people recommend on this board and most are personal preference. There are a few though that almost everyone agrees upon. Trijicon ACOG, recommended models will vary. New grip, much more comfortable than stock A2 grip. Accessory rail hanguard, to mount vertical grips, bipods, lights, lasers, ext. A PRI gasbuster charging handle or the big latch, makes it much easier to work the charging handle especially with gloves. An adjustable stock, 5-6 position is best,Vltor and Magpul seem to be liked far more than the others, much easier to find the perfect condition especially with a poor eye relief scope. A good quality sling, no real consensus. BUIS, Arms#40 is by far the most recommended, in case the scope fails, especially a battery operated red dot. A light, no real consensus on a model but Surefire is the most recommended manufacturer, light is for ovious reasons. USGI magazines,get good quality and lots of them. Ammunition, no junk or reloads and get lots of it. I think that most of the rest of the stuff people argue over allot and is personal preference like vertical grips, lasers, chrome bolt and carriers, flip up front sights, muzzle brakes, 2 stage triggers and a few others. I think that one of those tactical shooting clases would be great. I have heard nothing but good things about them and they have to be a blast.