O.S. Inner Head 21VB (P) V-Spec 21CTower Stock# OSMG5012 • Manufacturer Stock# 22105100
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Notes from our tech department:
OS Max .21 VZ-B V-SPEC-T engine
It is the second part of a Two-Part system along with the Outer Head.
This design allows for easier replacment of both the Inner & Outer parts.
One Inner Head, also known as a "buttonhead."
Diameter: 33mm (1.3")