A mistake was made during the filming of the “308 Battle Rifles” video (time stamp 4:48) and a clarification should be issued to mitigate confusion. The component highlighted is actually the bayonet lug. Delayed roller locks auto adjust to the cartridge. As long as you meet a minimum power factor the gun will self regulate. I have CLEARLY never needed to adjust the gas on this gun. THANK YOU to our awesome subscribers for keeping me on the straight and narrow. I cant be right 100% of the time. The Full30.com version has been corrected and an annotation was placed on the YouTube upload Thank you for watching….and paying attention.