I clean my A-tec,using the ultra-sonic, after every use. Depending on how many shots you have fired up to now, you might have a hell of a job being able to strip it at all. I also take out the mounting spigot, as I use the same mod on two differently threaded rifles. I would also recommend, making sure that the baffles always go back in the same order, as they are prone to gas cutting and if you swap them about they'll all wear out at the same time. I also couldn't find an Allen key to fit the front cover so had to grind a bigger one down to fit.