I have a Dytac G Style SMR installed on my VFC 416 and I would say it's average quality. I didn't experience any fitment issues since I did a lot of research to make sure I got the right rail (I did have to grind off the sling attachment points at the front but that is required anyways).
Some things to be aware of:
- The edges of the cuts on the rail can be sharp (here is a
review from another thread)
- The metal is rather soft and it is prone to dings