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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)
