Ive got an extra Vltor lopro gas block that i was gonna use for a previous build and IIRC it is a .750. I'm going to be changing out the handguard for the new Spikes Rail when they come out. Probly a 10".
My question is does anyone know what is the diameter under the gas block on the upper already?
Anybody in around Elizabeth City wanna help me with the change out when I get the rails