Questions on AR10 extractor

[Cville]

I think I'm going to buy the Superlative Arms Adjustable gas block. Not sure if I should get the clamp type or set screw. The current gas block is a set screw. I don't know if the barrel is dimpled. I'm also not sure if the clamp on require more room in the hand guard than the ones with the set screws.

[Cville]

I just got my rifle back after having the new gas block and muzzle device installed. Can't wait to try it out.

[Bang]

At hand guard assembly I'd suggest taking careful measurements that can establish where the adjuster is and if the guard doesn't have an open area giving access, drilling or Dremeling the guard to allow access.