interesting, receivers are not classified as firearms so I wonder why you still have to buy them from an FFL?
you can knit pick all you want but but AR receivers are sold as pistols to make it legal for you do do whatever you want with it, whether it's build a rifle or pistol as a pistol can be converted back and forth between longarm and handgun but a rifle can not be converted to a handgun.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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