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Ships within 48 hours · Estimated delivery Aug 25 - Aug 30
Most brands use SUS303 seamed steel because it's easier to machine
What's in the package
Each receiver has a unique CNC engraved serial number
and has better technical specifications than other brands while still being affordable
Barrel End-Crown Diameter: ~7
SRS Variable Mass Piston aap-01 Most brands use SUS303 seamedSRS Variable Mass Piston 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 For Pull Bolt Only 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.