I was wondering If I need the scrapping tool for my P7 or not? This is my first P7 and I'm new to this gun. I've read conflicting things here and on other boards about how you need the scapping tool to clean the tunnel the gas piston rides in properly. I've also heard the the tool shouldn't be used so which is it guys what have you P7 owners found to be the case? Can the gas piston tunnel be cleaned properly with the supplied brush or do I need to tool? I've read that over time the tunnel can become fouled and impede function. Thanks for any help guys.