Originally Posted by
Stickman
Most people are never going to change their muzzle device, and are never going to change their rail system. With that in mind, there is no down side.
If you are one of the people who needs to swap things around on a regular basis, its probably not going to be the best of choices, but for the vast majority of shooters its a non-event. Guys who are swapping things around all the time typically have multiple uppers and weapons anyway.
ETA- Just another perspective based on my experiences, and the experiences of a lot of other people.