My AR-10 cycles 100% of the time without a suppressor, but has some failure to eject issues with a suppressor. This leads me to think I'll be putting on an adjustable gas block in the near future. I have never purchased one, and would like to get your opinions.

The current handguard covers the gas block by a few inches. If possible, I would like to keep that handguard and get a gas block that I can adjust with a long hex wrench, or something similar. Any recommendations?

It's a Gen 2 Palmetto upper if it makes a difference.