Master Mods Master R-Hop Chamber Rubber for GBB

The Master Mods Master R-Hop Chamber Rubber for GBB is made from hardened rubber for use with heavier-weight BBs, increasing accuracy & performance. It is the perfect upgrade part for your GBB if you a seeking that bit of extra performance on the battlefield. It only works when paired with a Master Mods Inner Barrel Set, so make sure you have one of those too!