Had the chance to run a box of WWB thru my new MP9 this morning. Function was perfect and accuracy was excellent. I was not really trying for accuracy, mostly just seeing how quickly I could get back on target running double and triple taps. I did not take any pics, but all shots at 12 yards were within a 7-8 inch group, with multiples in the bullseye from the 1st shot in each string. To say that I am pleased with this gun is an understatement.