Hey guys. i have a G&G Combat Machine M4 (nonblowback) and was thinking about buying a gas blowback conversion kit for it and everything. the only thing is, on the gun, the charging handle does not open up the dust cover, and the dust cover is held closed by a spring, so you have to manually pry it open with your nail to adjust the hopup and when you release, it closes right back up. is there a conversion kit or some mod i can do to make it so that it the charging handle functions like on a gbbr so i can have the looks of the gbbr? if that made any sense at all. if not, post and ill try to explain a little better.