Carbine gas systems leave very little room for a hand guard if you keep the front sight. To me they just don't look right and certainly are less comfortable to shoot/hold. I have a Colt with the same SL hand guards on it and I think it's about the best option going for a carbine gas system if you want to keep your front sight.
I have another Colt with a 13" Troy Alpha rail/tube and I shaved the front sight off it and use the built in flip up front sight.
I have other longer tubes over shaved or low profile gas blocks and I like those guns better but for a KISS gun, give me the SL hand guards and the standard front sight.
