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Accuracy
Today while sighting my LMT defender upper in, I never got better than a 4" grouping at 50 yards. The barrel is in great shape. I'm thinking it is either ammo or my sights. I was shooting LC M193 55gr. The sights on it are magpul's gen 2 BUIS.
Is 4" typically expected at such a short distance? I plan to try other types of ammo as well (heavier than 55gr) All previous ARs I had were 1x9 (rifling)and this one is 1x7.
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Are you shooting from a rest to reduce variables? 4" at 50 yards is horrible.
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I run the MBUS too. They are fairly "crude' even when you use the fine aperture. Try using a regular rifle scope with some magnification off of sand bags or a good rest to test the rifles accuracy. I wouldn't ordinarily run a set up like this on a "battle" rifle, but its a good way to test accuracy. I can get hits at 400 yards with a RDS with no magnification, but I'm still just sort of guessing and estimating. Put a 10 or 20 power rifle scope up there and I'm not guessing anymore.
Try running some other ammo through it too. Some guns prefer different ammo.
Another technique I employ is to have another good shooter print some groups for me. Someone who prints small groups with their own rifle and knows what they are doing. If they print significantly smaller groups than you, you'll know its the shooter and not the gun.
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As bad as those MBUS sights are, I'd still expect to get half that group size. That XM193 usually is capaple of 4MOA at least...
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I'd use (or borrow) a rest and take you out of the equation as much as possible. That way you can narrow it down to "user" error or "mechanical" error. This is NOT an attack on your shooting etc!! It's just how you would step by step test anything (narrow the amount of variables as much as possible).
Once you determine user vs mechanical you can remove a lot of possibilities and focus on what is really happening.
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How many rounds in the group to get your 4" measurement? Where was your group in relation to your point of aim?
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Your groups should be at 2 inches or better at 50 years. Like Markm said the xm193 is a 4moa round out to 100 yards. But like other guys said try have another sgooter to see were his groups are printing.
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And you've shot enough with other rifles to be sure it isn't you?
Try some other ammo. It's possible(though unlikely) that your XM(while safe,) is super reject and suitable for close range drills only.
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http://i680.photobucket.com/albums/v...pscd0e54d5.jpg
I've been shooting for 20+ years. I was using a rest also. I've had other ARs in the past and so far this is the worst shooter. I haven't given up yet though. I plan to buy more ammo of a heavier weight.
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LMT uppers are usually very accurate. I belive it could be the sights. Try putting on a magnified optic and see how it groups. But definitely change out those irons.