SRS Hop Up Unit + hopup rubber
6061 aluminium CNC machining hopup unit (SRS407) for the Silverback SRS-A1. This hopup accepts AEG hopup rubbers (SRS408 60 degree silicone hopup rubber is included). Is also included : five M3x4 *e screws, 19×2 oring, 8×2 oring, and pre-installed 5.8×0.75 orings.