I use bore snakes and ditch cleaning rods altogether
Gas lock wrench is a handy tool , a rubber hammer works too, unless you plan to build a few rifles, then it's kinda handy.
Sadlak gas cylinder cleaning drills do NOT fit chinese parts. Princess auto is your friend here. Take your plug and piston with you and search the bulk, long shank bits for ones that fit cleanly.
DO NOT USE wire brushes of any kind as a substitute. NO oil or cleaning products either.
My 2 cents for ya and sorry I haven't answered your last message, been running an M14 clinic all weekend