!st build
Unless there is some reason for not wanting to have the right sideplate go thru a FFL, I would recommend the OOW semi kit. Everything you need is included, and you have only one place to call if something dosen't work.
That's what I did for the first one, everything went together and it worked the 1st time out, only problem was adjusting the trigger pull, and OOW walked me thru that over the phone.There seems to be an ongoing controversy on this site about disposing of "home built" (so-called 80% sideplate)1919's. Having a 1919 with a 100% sideplate with a real serial number and manufactuer's name would make that problem , if it is a problem, go away.