Get it off that bipod, I have not met an AR that I couldnt make it shoot 1/2" groups at 100yds. Get rid of that factory shit and Reload, reload reload. seems retarded when you put the words AR15 and reloading in the same sentence, but trust me you can cut groups in half with some tinkering. I have found Bipods to be pretty much shit to use when shooting for groups, get a good rest like the Sinclair, I have one of em, cost me a fortune but it Works ($250 got it here)
Trigger
Free Floater
good amunition
Stainless Steel (easier break in) or Chro Moly, stay away from Crome lining when accuracy is what your looking for. .
oh and MONEY gotta get some of this!! an AR will make you cry when you start buying this and that for it. it adds up quickly!! My very first AR was a Colt match Target comp that when I got done the lower/upper was the only thing stock on it and had $2500+ in it, since then I have found this website so building got cheaper and I learned dont start with a complete colt rifle!
Also if it wont shoot right, Break it in using 100 rounds, 20 single shot cleans (just barrel) 10 3 shot groups clean after 3rd shot, 10 5 shot groups and clean after 5th shot. Yes there are better ways, but this works for me. The last gun I did this way was a Bolt 7mm Mag, took 7.5 hours at my buddies shooting setup to get all 100 rounds done. so you might want to make it in 2+ trips.
In the process I found the barrel picked up way less copper at the end than the beggining, at first it was a bitch to clean and after a while cleaning was a snap. I aint talking run a patch brush and patch I am talking NO COPPER Left, gotta get it all out,