Thanks guys. Yeah I think there are. Few guys at flag raiders that verify. When I go check them out in a few weeks I will get verified.
mzo, have you ever tried duster gas in your mp7? I looked how to use it on YouTube and came up empty... I bought a 6 pack of air from Costco for like 20 dollars. I assume this will work. I also know that every 3rd mag or so should be propane with the lub in it. But to get the fps down would duster gas work?