How do you measure it?
This guide, presented by a professional gun shop owner, clarifies the legal method for measuring an AR-15's barrel length. It emphasizes that only the barrel itself, from the muzzle to the bolt face, is measured, excluding any muzzle devices. This distinction is crucial for determining if a firearm is classified as a rifle or a short-barreled rifle (SBR) under federal law, impacting transfer requirements and potential NFA tax stamps.












