Meterial for Cylinders

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Hi everyone, I trying to choose a very good Aluminum for having some cylinders made. The Aluminum material has to be able to keep its shape, does not gall on a mill cutter and transfer heat quite will. O and also be able to have it coated for Nikisil plating.

Next does Reynolds Aluminum sell small amounts, such as enough for about 20 cylinder?

Lastly, in the US please, I'd prefer in Southern California.