Originally Posted by Grayfox

Since the invention of M-Lok, quad rails are out. Quads are bulky and uncomfortable to handle. Most people end up buying covers to go on most of it to keep from tearing up their hands.
With M-Lok you can choose where and how much rail you need and many accessories can be mounted directly to the handguard without rails.
Check the Magpul web site and see what all is available.