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Look at Match’s results, both on copper and aluminum stars here

The triple XM-L board I have appears to be G10 with perforated metal pads, silver plated copper? But it doesn’t appear to have a solid metal thermal path to the pill or heat sink below it. That’s what I was referring to.

And Qlite’s appear to have G10 as their substrate, I’ve got lots of G10, as big as 2” thick x 12” round. I’ve made so much from the stuff I recognize the smell when filing off the attachment tips to fit it in the pill.

Even made custom grips for a .45 Ruger Vaquero out of G10. Almost indestructible stuff, especially at that kind of thickness.