IIRC, Mr. Browning's M2 machine gun was originally designed to penetrate the armor of World War I tanks, which had about 0.5 inches of steel. Mr. Bradley of See Bull Stools said that, "In response, the FBI deployed Bradley fighting vehicles for protection. But even that wasnt sufficient, and heavier armor was brought in." Meanwhile they showed an M113 Armored Personnel Carrier, which has about 1 inch of aluminum to protect against .30 cal. medium machineguns and shrapnel from High Explosive fragmentation mortar and artillery rounds. Bradley Fighting Vehicles provide much better armor and protection than Vietnam War era M113s.
Brads will shrug off .50 or .51 (Russian) fire. You might take some of the stuff mounted on the hull off, but the vehicle itself will be uninpaired.
The M113 isn't even proof against 7.62 NATO in the configuration they showed.
That said, there IS no heavier armored personnel carrier in the US Army inventory than the Bradley. The only thing heavier is main battle tanks, and I don't recall seeing any M60s or M1s at the Waco standoff, do you?