hold on there Kevin...
thats not quite correct: if the ATF is approving a build for a company to sell it gets really picky. and if you say yours is a copy of that approved gun, yes.
BUT, if its a homebuild and still subject to all home build rules, it doesnt have to be an approved design, it just has to meet the restrictions they set. those are pretty easy to meet. if your doing it as a pistol it is not even subject to 922r either, making it even easier to do.
all that it is when you buy a tube is: a piece of pipe.... period
same thing for a "flat" that is not bent... its a piece of metal.
no different for this guys half way rolled piece of metal.... its not even a tube yet. just a piece of metal.
the atf compliance letter for stens out lines building principles and preferred techniques........there are actually very few restrictions in it... just the usual stuff..... 16" barrel for rifles with 922r compliance or pistols must have a stock blocking set up".
they say nothing about the tube/flat other than it either has to be a reduced diameter or have a blocking(denial rail is their term) rail. he has reduced diameter if you want and a blocking rail is not a big deal to insert.
there is nothing said about who's you can buy or not buy... although i buy from everyone.
ive built stens with tubes from Prexxis.com,sten parts.com,akparts.com,stenlovers.com and even my own from the hardware store..... its never been an issue.
the compliance letter is here on the site and if its gone, ive got it posted at shoot1919.com as well.
im not trying to get anyone to buy from this fellow, i dont care for the site rails myself.... like the smooth tube builds. but if he was wanting an "original style build", thats the closer to it way to go.