Sorry I have lost my invoice for the stainless tube. I will get the details from the steel shop tomorrow.
This is the company I have been dealing with. My boss has an account (we through several thousand dollars worth of stainless a week so his prices are pretty awesome)
I’ll post the exact part # for easy ordering after work tomorrow.
I opted for the 600grit milled 316 tube. It was a little pricier than the rough milled tube (320 I think) but it makes no difference to the accuracy of the nominal OD, it just had a much smoother finish (like half way to mirror finish I guess).
Aesthetically, it’s very pleasing (if your into all that lol) I just thought it might promote smoother motion, and less wear? Maybe?