That's the great thing, there are places out there looking for work for their machines. Make a print and send out for quote, then you're left with assembly, no machine investment at all.Yes, of course I try to design everything I make based on available commercial material stock sizes. I could easily build a machine that automatically cuts stock SS rods to length with a high degree of accuracy. It's the slight rounding (or at least chamfering) of both edges that has me a little worried though.
Not knowing what this is going to be or where it is used, just make sure you don't make the clearances to close if it is going in a wet or adverse environment. That was the beauty of the thought behind the AK-47, Kalashnikov kept the clearances loose so it worked in any or most any condition, but still got the job done. And looser dimensions cost less to machine. You will find a big difference in price between a part made to 0.0005" than one made to 0.001" and even more when you are able to use 0.002" or more.