ProWin 5.5 X 1MM O -Ring for Prowin Model 17& 18C/ Hi-Capa/ MWS M4A1 GBB Gas Magazine

ProWin 5.5 X 1MM O -Ring for Prowin Model 17& 18C/ Hi-Capa/ MWS M4A1 GBB Gas Magazine Rubber Construction Design For Replace the Original Parts Suitable For Tokyo Marui Model 17/ 18C Pistol/ Hi-Capa Pistol/ M4 MWS Series Gas Blow Back GBB Rifle Airsoft Guns