I have used both the Syrac and SLR DA7 from Rifle works with zero problems. the DA7 only needs one screw to turn and has a detent to lock it in place. Only time will tell if one is preferred over the other but with over a thousand rounds through both I have not had an issue with either so far and both have stayed where I have set them. http://www.slrrifleworks.com/products/ad...-gas-block
https://www.youtube.com/watch?v=saGc7bPx1pw
Both the syrac and DA7 adj. gas blocks fit under my small MI SS generation 2 hand guards.
https://www.youtube.com/watch?v=saGc7bPx1pw
Both the syrac and DA7 adj. gas blocks fit under my small MI SS generation 2 hand guards.

