What’s the big deal? AR or Winchester .30-30? Except the Winnie shoots bigger boollits.
This is probably rhetorical but who the hell don’t own an AR15 or variant? I don’t care if he’s packing a bazooka. Shoot the SOB. EOS.
If it is a military AR 15, then you can track the serial number. Don’t no how the civilian models are IDed but suspect they have several manufacturing numbers on them.