Anyone shooting bh209 needs to be aware that it can not be treated like smokeless powdwer in regards to corrosion. I have shot almost four cans throught two knight disc guns. One is stainless the second is blued, after three weeks without cleaning the bores they both show red rust. What is most suprising is the stainless gun shows almost the same amount of rust as the blue gun. My advise is not to let it go more than a week or so before full clean. The rust did come out with bore cleaner and did not pit the barrels. Just a heads up if you think you can shoot bh 209 and forego the cleaning for and extended period. I do not want to give bh 209 a bad name and will continue to shoot it, as it is an exceptional performer. This lack of cleaning was an experiment on my part and I don't want any one to have a corroded bore if they can prevent it. Every other claim from bh 209 is as advertised.