There are two distinctly different Browning BARs. There is the still produced hunting rifle, like the one you use to hunt white tails. Then there is the old military version, which was kind of the precursor to the SAW, the Squad Automatic Weapon. This was a very heavy (20 pounds or more) fully automatic rifle. It was used in WWII, Korea, and I believe possibly in Vietnam. I believe these guys are talking about the latter.
The sporting rifle is on top, the military on the bottom:
