After some additional work carving out a Deathwatch shoulder pad and sculpting it into a scout shoulder, I present Sergeant Grayvus of the Raven Guard who had previously served with the Deathwatch.
He carries a sniper rifle for its improved optics but usually has his scouts carry bolters and a Missile Launcher. In Grayvus's opinion it is better that his scouts train with the weapon they will use for centuries of service. He is a huge fan of the Land Speeder Storm, and often will embark his squad on one.
I took some of the criticism to heart and you can see how this all started here http://spyrle.blogspot.com/2012/08/raven-guard-scout-sergeant-with-sniper.html