I am looking for a taregt AR-15 to shoot at my club at 100 and 200 yards. On occasions I may shoot at longer yardage. My goal is to shoot 1/2 to 3/8 inch groups at 100 yards. I am considering a Colt Accurized AR-15, but I can't find any details on Colt's accurizing process. Is the Colt Accurized rifle comparable to other custom tuned AR-15s? Would I be better off buying a custom target AR or modify whatever I buy?