Whether a handgun affixed with a machinegun conversion device constitute s an "arm" under the Se cond Amendment' s plain text, thus requiring the government to justify the machinegun- possession prohibition under 18 U. S.C. § 922( o)(1) by demonstrating that it is consistent with the Nation 's historical tradition of firearm regulat ion.

Whether a handgun affixed with a machinegun conversion device constitutes an 'arm' under the Second Amendment's plain text, thus requiring the government to justify the prohibition under 18 U.S.C. § 922(o)(1) by demonstrating that it is consistent with the Nation's historical tradition of firearm regulation