As far as your comment about other rifle or suppressor set-ups to consider. With your intended goal of a suppressed only rifle, you may want to look into a gun that is gassed to run with a suppressor on all of the time.
Check you Sionics barrels. They have two 11.5" barrels for suppressed use. The RGP (reduced gas port) barrel is designed to run full power ammo unsuppressed (barely), but is optimized for suppressed use. The ERGP (extreme reduced gas port) barrel has an even smaller gas port fur running suppressed only, and although they say it could run without a can, it was never intended to, and is not recommended.
Another option if you are wanting a different barrel or barrel length would be the black river tactical gas block inserts or gas tubes. You can pick your barrel, then work with them on a specific size that is small enough to run with the can you use and not be overgassed.
If you are wanting a suppressed only rifle, I would avoid the adjustable gas blocks etc. as they are another potential failure point that really isn't needed for your intended project, in my opinion.
Also, I would suggest for most applications staying with at least an 11.5" barrel, possibly even a 12.5." They are usually more reliable in different conditions and with different ammo, as well as giving you better performance out of most ammo. As always your intended use makes all the difference in what equipment you want to use.