Set of three shims to be placed between the piston head and the piston to modify / adjust the angle of engagement between the first tooth of the piston and the first tooth of the sector.
The insertion of such thickness causes a slight retraction of the piston and decreases the angle of engagement.
This procedure can increase the reliability of replication.
Moving from a standard hook-up angle (like MARUI) to a non-standard one, it is advisable to make the modifications to the piston (elimination of the second tooth and possibly reduction of the third).
If you are a beginner, you should contact technicians with proven experience.
A normal piston head can withstand a maximum thickness.

Technical data:

- internal hole: 5 mm
- external diameter: 18 mm
- thickness: 1 mm

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