Certain firearms like short-barrel rifles (SBR), suppressors, calibers > 50, and machine guns require an ATF license. That said - these aren't hard to come by. Many people file multiple ATF form 4's (with a $200 tax) to acquire suppressors, machine guns, and SBR's. 8 is nothing special, you'll see people on r/guns with more.
The tl;dr is if you have the mone and time and clear background, its not hard.
Certain firearms like short-barrel rifles (SBR), suppressors, calibers > 50, and machine guns require an ATF license. That said - these aren't hard to come by. Many people file multiple ATF form 4's (with a $200 tax) to acquire suppressors, machine guns, and SBR's. 8 is nothing special, you'll see people on r/guns with more.
The tl;dr is if you have the mone and time and clear background, its not hard.