This guy finally has a production version of his ambi magazine catch. The design looks great but I'm not sure about the materials. Maybe someone with better knowledge about these materiels can chime in.

They're made of machined Acetal with a zirconia insert for the actual bit that retains the magazine.
Acetal is apparently a tough, rigid polymer that is resistant to solvents, but that's about as much as I can understand.
He's got it priced at about what a Norgon Ambi-Catch costs. What does everyone think? Im probably going to get one just to give it a shot.
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