@ Rat Reapet from the chronograph report from AoA, my FX Royale 400 was shooting JSB 18.13 at an average of 890 ft/sec. I’m guessing it will shoot the JSB 15.89 around 920 ft/sec. It had what looks to be a FX factory regulator with 2 small metal washers on the regulator as I was told that how FX...