For Sale is a Genuine McCulloch New Old Stock Chainsaw Piston and Rings. 

Part Number 85240 which replaces P/N 69412

For Standard Bore - 2.00"

Does not fit the later models.  Measure your bore before you buy this.

This fits:

McCulloch Mac 4-10

McCulloch Mac 5-10A, 5-10G, 5-10E

McCulloch Mac 6-10A, Super 6-10A

This is 25+ years old, unused inventory, these are no longer available.

This may fit many more McCulloch saws so please ask about your application.

Check out my store for more parts your McCulloch saw.