The tip of a shotgun barrel will not achieve red heat by holding it into a normally aspirated gasoline fire as shown. Steel only starts to faintly glow red at 525°C while the flame temperature of petrol is only 500°C. To make the barrel glow within a few seconds, an oxy-acetylene torch or similar high energy heat source is needed.
Some of the money from the stockyard heist has large portrait profiles, which didn't come about until the late 1990's.