Great write up @ajumma, I'm pleased someone was able to road test it.... I'll stick mine into my CQBR at the weekend and see how it performs using a stock Marui bucking and a prometheus inner barrel... I'll measure the decibels too and see what the difference in sound level is between the Marui and the G&P if anyone is interested in that metric...
By the way, what brand of gas are you using ?