I don't but it's very likely one of our members could machine one for you. You will need to find some MGC P220 cartridges, or one of the replacement types made by a couple of Japanese custom shops. Sadly the original P220 cartridges are no longer made.
I'd suggest you post a Wanted ad' in the Modelguns/parts for Sale category. I'm sure you'll find help through that.
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.