He was convicted of exercising his 2nd Amendment rights, which are totally prohibited in Japan and Constitutionally protected here. Details are given in the beginning of the SCOTUS ruling, linked to above.
Are we to assume then that he found some way to legally bring guns and ammo into 2nd Amendmentless Japan where such are banned?
Would his felony conviction for illegally possessing guns where guns are banned in the USA-New York or Chicago for instance, prevent him as a felon from possessing weapons according to the US law forbidding possession of weapons by a convicted felon???