Hello everyone here is a photo of my latest hop up mod shape of the contact site to bb. Problem is it is too effective and even with very low hop it still manages to jam a bb every now and then. I believe it is because it has low fps and 650 mm. It has a m150, a bore up writ fully sealed cylinder, 6.01 madbull of 650 mm and a 11.1 Li polymer 1800 mah battery. It is shooting 372 fps +/- 3 of variance with 0.25g. Let me know any suggestions of solving the jams besides cleaning the barrel again. I was thinking along the lines of increasing the fps drastically as not to give the bb time to spin up inside the barrel and use heavier bb's.