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I've thought of the wax/wood/plaster prototype, but its honestly not that hard to just mill sections out and weld in what I want and test it, and if it needs tweaking just mill, weld and grind some more until its where it needs to be.
I just need a material able to be worked in those ways.
I'll try and see if I can find someone that makes one in 6061 or perhaps could sell me a set in 7075 before they heat treat them
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Essential Arms made a small run of steel lowers when they first came back into the ar lower buisness. They were not stainless just some type carbon steel. According to the owner he sold me the last one he had at the time. You may check and see he may have made some since then.