Question: atf can i shoulder arm brace?
Answer: In 2014, the ATF said that shouldering a pistol brace meant your pistol would be classified as an SBR. ... In 2017, the ATF reversed their opinion, saying use of an unmodified arm brace as a buttstock isn't illegal. As of 2020, the ATF has not changed their last opinion. You can still shoulder a pistol brace.