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I have held a tight as +/-.0001 before but dont do it typically I do have a 4 jaw (12") & a collet setup + 2 six jaw chucks & several other 3 jaws (& a large mill & tool & cutter grinder as well as other misc tools in my shop). My new jet lathe only has a 3.125 dia thru spindle so I can't put the frame inside & that is one of the reasons I wanted to take the barrel off. For ref I have been machining & welding since 8th grade (almost 40 years ago) & did it all thru HS & college but since then it has only been my main hobby as I typically work as a design, mfg, or tooling engineer in turbine & rocket engines. I will check out some of the book that you mention & see if I can gleam some extra hints from that. I decided to work on this gub cause it isn't stainless which I really prefer so I thought this would be a sort of test bed gun to try some things on.
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