I have a 5.56 rifle with the mid-length version an a 7.62 rifle with the rifle-length version. The tubes themselves are interchangeable, only the mount itself is different. It is a well-thought out design. Every maker and their mother makes a four-rail handguard. This is one of the very few clean "mount it where you need it" products out there. It doesn't have enough clearance for a gas piston without extensive modification, but you don't need one anyway.
Pros: Strong, versatile, lightweight, and good looking!
Cons: Won't work if you want a piston operated rifle.
This review was written in the old system and had content requirements that are different than reviews written today.