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CNC Steel version of the variable mass piston body, for extreme mass configuration (55.1 grams instead of 19.0 grams for the aluminium version).


Compatible with:


– original SRS piston (SBA-BPS-13)

– original TAC-41 piston (SBA-BPS-30)

– variable mass piston for SRS (SBA-BPS-18)

– variable mass piston for TAC-41 (SBA-BPS-31)

– original SRS piston end (SBA-BPE-01)

– original TAC-41 piston end (SBA-BPE-03)


Please Note

When buying parts from Longbow BB Ltd, you confirm you have the required ability to install and tech your airsoft replica as required. 

Longbow BB Ltd do offer a paid for service option for us to look at your rifle and try to solve any issues you maybe having. 

We need to manage your expectations as we (Longbow BB Ltd) are unable to provide extensive hours of tech advice for parts purchased that have been installed by yourself. 

All parts are inspected before dispatch to ensure product quality.

Steel variable mass piston body (for SRS & TAC-41)

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