I like to round out the low mass bcg and buffer system with a good adjustable gas block and compensator. I've tried syrac gas blocks and they work very well but both syrac gas block set screws have seized up on me over time so I switched to seekins.
An adjustable gas block allows you to tune your rifle to the load you are using.
A good comp also helps keep your rifle flat. I really like the SJC Titan and the seekins comp.
Enjoy.