Charlie is only making the odd one now...not a full time shop.
Charlie has some stock. You have to ask and if he has it, he will sell it to you. I got a 6 mm check maker from him a few months ago.
I have five of his Freechex III check makers. The challenge is finding copper or aluminium of the right thickness.
The local window frame metal cladding company had scraps of coil stock of different thicknesses - You can tailor a gas check to the bore and to the bullet shank.
They usually carry the thin stuff. Had to order in the standard size at .014
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Give me a pm or email if you can't find what you want.
Thanks
Jerry