How do you remove barrel from browning bar?

Answer 1

Both the civilian sporting rifle and the military light machinegun that go by the name BAR have barrels that are not removable by the user. They require special tools to remove them without damaging the receiver (frame).

The website for Browning Firearms has a downloadable owner's manual that covers assembly/ disassembly, and it instructs the owner not to attempt disassembly beyond the point listed. Normal cleaning and maintenance is performed while the barrel is attached to the frame. If you want the barrel replaced, you need to visit a gunsmith with a set of action blocks and a barrel wrench.