As promised I took a couple of crappy cell phone pics of my new gasbuster. I had hoped that this mod would work well but I'm shocked at how much easier is it to shoot the rifle without all of the blowback in my face. This small change will absolutely save me some time in the next rifle match! Keep in mind that I did not clean the gasket material up at all. I just put it on, smoothed it out with the end of a zip tie, and shot it. These pics are after 100 rounds this evening.
Looks great. Glad it worked out for you.