So, I called up Elite Iron and I was again reminded why I like them. Not only do they make an excellent product, customer service is second to none. Not only did I get a hold of a live body. I spoke with Dale, (one of the owners) who had me wait on the line so he could finish working on a machine he was running.
He took the time to explain that yes materials do have a small impact, and some materials are actually made to absorb sound (zirconium). However, the most important aspect to building a suppressor is hydrodynamic modeling.
Makes sense, anyone can stack a bunch of baffles in a tube. Its the research and precision that makes the difference.
By the way, they are looking for a CNC operator. Unfortunately, I am not, otherwise I would be packing for an interview in Montana.
Full disclosure: I have no ties to the company and receive no compensation. Just a happy customer, but if someone would like to teach me how to run a cnc machine I'm game!
, Excellent video on the history of the 1934 NFA law and the ridiculous reasons that came about in passing it.