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.

Silverback SRS Variable Mass Piston
Metal Construction
Customizable mass with different weights (40 to 137 grams)
NBR piston cup
CNC AL 6061 T6 piston head
CNC AL 6061 T6 piston body
CNC steel piston end
CNC aluminium flyweight (4 pieces)
CNC steel flyweight (4 pieces)
PTFE grease
Tools
Suitable for Silverback SRS line of airsoft rifles (Pull Bolt Only)