ESC works hop up packing for VSR rifle/gas pistols (60°)

New custom rubber fabric with super soft surface too improve shooting acuracy
new internal cone shape with best hop effect especially made for heavy weight bbs (ideal use with open hop up window barrel)
for VSR rifles and pistol 1911, hi capa, p226, mk23, g17, m9, samurai edge, meu 
fits Marui, WE, KJ gas pistol and compatible brands