G&G Cold-Resistant Hop-Up Rubber for Rotary Chamber

The G&G Cold-Resistant Hop-Up Rubber for Rotary Chamber is specially designed for the G&G airsoft replicas with a Rotary Chamber.

The replicas with a rotatry chamber use a different type of nub than G & G replicas where the standard bucking goes into it. This bucking fits perfectly with the nub used in these chambers.