Want to work up to 1000yd...need build advice on the reasonable for the rifle

[LRRPF52]

"As far as finishing an 80%, I already have the parts, but maybe I will buy some well respected 80% lowers and send then to friend mentioned above as he has made thousands of them (understand their FFL info would have to go on the side and the lowers would have to go to a FFL, not a problem) and being AS9100 and ISO9100 Certified, they machine correctly as most of their machining is somewhere in the aerospace world, he probably had a program already where he could bolt in a 80% lower and finish it off as I think they are are running at least 4axis machines"

that is incorrect. you must be a atf licensed firearms MANUFACTURER NOT JUST AN FFL HOLDER to manufacture lowers for someone other than yourself. Read the atf rules on this it is very clear. If he is a licensed manufacturer then no big deal all is good. if you do your own 80% understand you can never sell it, give it away or leave it to someone. I have done many of these. time consuming but not difficult just take your time and not rush it. much cheaper and easier to just pick a 100% lower with the logo you like and build it. especially if funds are a concern. there are only around 10 forgers in the country that forge all lowers sold. most companies just engrave their company info on somebody elses lower then coat or anodize and sell it as there own.
of course this does not include the suppliers of the billet lowers. just giving a little insight.

I don't think that's correct. My understanding, after reading the law, is that you can't manufacture firearms with the intent of selling them without a specific type of FFL (07). If you complete an 80% lower, then down the road give it to your daughter, wife, son, nephew, etc., it isn't regulated. If you start cranking them out and selling them, you're considered to be operating a firearms manufacturing business without a license.