I was told the mlok accessories may interfere with the barrel and I appreciate the feedback. Nice to hear from people that have first hand knowledge.
As said, they don't really interfere with the barrel itself, only the removal/installation process. The diameter of the chambered area is too large to slide in or out past the m-lok inside attachments. Once the barrel is installed, there shouldn't be any interference, so other than when changing barrels you should be fine. Your options when changing the barrel are to either remove the m-lok attachments first, or the forend (but then it may not slip over certain muzzle brakes, so...still a pain.
I agree that with the key-slot pic rail sections provided with the gun, it's a much better solution to just go that route.