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So following the logical approach, I bought my Anderson AR15 online and they sent the lower to an FFL of my choosing and the upper came to me at my work and I assembled them, then my gun is a Frankengun....
I like turtles.
I bought it thru Sportsman's Guide and looking at their website they have rifles that have the word "kit" in the listing and states that the fully assembled Lower will ship to your FFL of choice and the Upper will ship to you. Interesting....It sounds like you bought the rifle through a third party who bought Anderson rifle kits and Anderson lowers then they assembled them. If they put the upper and lower together they become a manufacture and there is an 11% excise tax that needs to be paid as a completed rifle or it should have shipped as a complete rifle to the dealer not the upper to you and the lower to the dealer.
Probably the best way to go is just research then buy from a good builder. Consider Colt Industries providing a complete firearm. Unless you are experienced and equipped to properly build your own, (and most are not) then consider not building your own. It is what you do not know what you do not know that can get you.
Respectfully. Hundreds of AR15 builds. Uncounted M16 rebuilds. All the gages, gigs, special tools, wrenches and widgets were sold off years ago. Even for me to do another precision AR15 build today would cost hundreds and hundreds in build stuff just setting up to do it again. Just buy a complete rifle. Easier and safer.
wired. DSAPT9. Koda. Respectfully; input based upon ignorance does not help this forum. Some of us can provide helpful information based upon actual experience and wisdom. Said another way, been there, done that.