Re: Australia: Thousands Download Instructions on How to Make a 3D Gun
Ohio Ordnance Works makes the John Browning designed M1918 Browning Automatic Rifle. They also make a modernized, updated model call the HCAR-Heavy Counter Assault Rifle.
You might be able to print one, but you would have to find somebody nuts enough to let you disassemble one and scan all the parts. Finding a printer to print hammer forged barrels and stuff might be challenging.