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Message: <blockquote data-quote="AR Addict" data-source="post: 2894781" data-attributes="member: 41063">Only had it happen once, and it didn't take much at all, I could have left it as is but it would wear more to have it dragging too hard on one side. I'd definitely check everything else first, the barrel nut (MI G3 in my avatar) I used didn't have to be timed, the gas tube just went over the top of it and I checked and checked my GB. It had to be the tube, nothing is prefect all the time.I wouldn't have even thought to check it had I not read about others with the same situation on the AR forum. There is even a special tool just for this, but with how little I needed to move it I just did it by hand. For a lot of guys it's just considered another possible step.</blockquote>