I'm not sure what else to try, I don't Imagine I am able to modify gasoline on this FN 15 Tactical II. I was planning to test it's possible a heavier spring. I also tried using utilizing my Spike's Tactical light-weight NB BCG and had precisely the same benefits.I tried a lighter H1 buffer and a very large 8.2 ounce . The H1 exact same factor as we