Feels well made but did not quite fit my shotgun. - Choate Tool Mossberg Short Pistol Grip Forend

I bought one of these for my Mossberg 500a. It was a bit too snug on the magazine tube. It clenched the rails a bit to hard. And also rubbed against the barrel at the end of travel. I’m willing to give the benefit of the doubt here and assume this is a defective product in particular, as opposed to all of them being bad.

Or perhaps I made a mistake in the process. Which I don’t believe thatI did.