I got an ar45 in and am unable to get better than 1 1/2 to 2" groups at 25 yards scoped. I have tried 6 or 7 loads, factory and handloads. I have tried 3 scopes, 2 different handguards and barrel nuts. I even had the barrel recrowned even though it looked good. Reading about other blowback carbines online, most of them get much better accuracy. My next step is to replace the barrel but I don't want to spend that $ if I don't need to, any ideas?