There is no rule saying airsoft is banned in china however it is illegal to possess any sort of fire arm including replicas. The places people see only sell gear nothing else, no receivers rail systems etc, even though china produces these they are not allowed to be sold locally and can only be exported all the stores in beijing ive been to sell lots of gear ( vests, BDU, belts, etc.) but not guns the only accessories ive seen are Red dot sights, Sniper scopes, flashlights and lasers.
VFC HK416 Custom
Custom Bowie Tactical x SAI Glock 17 (TM Base),
Custom SAI BLU Glock Build (Timberwolf Base)
Custom Zev Noveske Shooting Team Glock 34
Custom Zev Dragonfly G17 (Project) (In progress)