I have been thinking about getting an M17S lately. For those of you who have one, how hard is it to more than the usual field strip. For example to clean the gas piston or operating rod. Do you have to unscrew the locknuts on the muzzle end of the barrel in order to do this ? I have had a FAL before and cleaning the gas piston was easy. It does not look so easy to do on the bullpup.