Hello folks.
When you look at the standard rifle handguards of AR15, you will see the rear holes where your hands go are blocked. I understand that you do this to prevent your hand from burns but why do they block holes even in upper heat sheilds?
I was going to purchase M5 RAS just because I want better air flow but before that I wanted to try making holes in upper heat sheild so it would yeild better ventilation. Has anyone done this?