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I've have many MI products and love them all. I'm sure this will be just as nice. Might have to give it a try.

One randomly wild possibility is that one of the washers on the rear part of the rail was forgotten. Without this lock washer in place, the bolt retaining the top rail will protrude and impinge against the barrel extension.

I have a recent 2020 model. And the detent is loose also, same issue with the OEM charge handle. i haven’t had time to inspect and figure out why the looseness. It could be a variety of things..

Have you tried inserting the barrel without the gas pistons installed? Perhaps that would help you locate what part of the barrel assembly is the problem. My M4 barrels all fit snug the last millimeter or two inserted into the receiver but not a “something metal is in the way” kinda snug. While inserting the barrel tang into the receiver I’m usually slightly twisting, jiggling, and firmly pushing the barrel towards the receiver; it sounds like you are doing the same. I just recently picked up my M4 Entry model that had been awaiting ATF Form 4 approval for one year and one week. I purchased it new from a high-volume Benelli dealer so I’m guessing it was manufactured about 16 months ago +/- . This newer M4 Entry is significantly tighter in fit and finish than my other M4’s (also purchased new). None of my M4’s are loose but this M4 Entry doesn’t go together nearly as easily. Maybe a couple of range trips with slugs will help this shotgun adjust and get broken in.

Mine is tight on my m1014