My p90 .40 has not improved in accuracy since I bought it in 1994. I never seasoned the barrel like you would a rifle, but I keep it clean. Although it' s no tackdriver, I' m satisfied with the accuracy of my .40. It' ll hit a pie plate at 25 yards every time (yeah, that' s not too specific but it' s all I need out of this type of firearm). Just guessing, but the lack of a bushing at the end of the barrel probably limits accuracy on these guns. Also, I have to fight the tendency to let the gun roll down while squeezing the trigger.