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)