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This special piston will allow you to tweak the muzzle energy of your SRS by adjusting the piston mass from 40 to 137 grams with 15 different configurations
M2 top rail
10- O rings for in between the weights or cylinder head to stop the weights from loosening by playing
This tool can accept any bolt knob in our catalog as handle
Can easily fit your HPA bottle
Fast Hop Up Unit (Left Handed Version) SRS Upgrade This special piston will allowFAST Hop Up Unit (Left Handed Version) for Silverback SRS A1 (Field Adjustment Setting Hopup). 6061 aluminum CNC machining hopup unit for the Silverback SRS A1. This new design allows you to adjust your hopup in game without any tool, in just few seconds. This hopup utilizes standard AEG hopup rubbers and AEG barrels. Packaging includes: CNC 6061 aluminium hopup body end (SRS425) CNC 6061 aluminum hopup body (SRS426) CNC 6061 aluminum hopup ring with