"Do no put oil inside your gas system as it will carbon up and make a mess"

With normal petroleum based oil I will agree, as it burns away. I have found that the synthetics will actually help the carbon issue. Ever since I started wiping the back of the bolt (gas side) and the interior of the bolt carrier with Tetra the carbon build up in these two problem areas virtually wipes away.

Good shakedown of the operating cycles BTW....