u/PsychologyDistinct69

has anyone ordered an ar upper online (shipping thru fedex) and had it flagged? if so any issues with that happening?

I'm looking for websites that you can purchase ar uppers and other parts that will ship to mass any recommendations??

i just bought an pre8/1 ar lower and i want make it into a ar pistol can i just purchase a new 10.5 upper kit or is that not allowed?