What is the intended purpose of this rifle? How will you shoot it mostly? How far away do you want to hit things?
Even without knowing those things I will go ahead and recommend a new grip. Get rid of that stock A2. Even at $20 you can get an Ergo Suregrip or Magpul MOE. Best mod for the $$ IMO. If I did nothing else (yeah right. . . ) to my AR I would still change out the grip.
If you do this first you'll probably know EXACTLY what to add/remove from your rifle after the first class.
I will look into those, Thanks
Re-Barrel it for 6.5 Grendel.
You'll turn your short range poodle gun into a 1000 yard rifle! Recoil is only slightly more than the 223/5.56 but bullet weights run up to 130 grains and are suitable for game as large as elk (with confirmed 1 shot/thru & thru kills at 400+ yards).
At 400 yards the Grendel still retains over 1000 foot pounds of energy while the 5.56 military load barely carries that amount of energy past 100 yards. For comparison, the 6.8 SPC II factory loads carry 1000 foot pounds of energy out to about 230 yards and the 7.62 NATO (308 Win) carries it out to about 525 yards.
you need one of these for those bumps in the night:
www.Elzetta.com
I just got in some of the Zorm mounts and the ZFL M60 2 cell w/strike bezel with the high/strobe mode. Its the only light I know that will stand up to a shotgun blast!