The fluted gun barrel on the .50 looks like a scale-o-rama from a smaller scale 25mm Bushmaster chain gun barrel. Definitely something that looks like a good scout/reconnaissance platform.
That fluted barrel used for the .50 gives me an idea for something similar in 35th scale using a 72nd scale 25mm Bushmaster fluted barrel on a 35th scale M2 Browning. With the increased surface area available it would promote a cooler barrel and thus more rounds fired before the barrel required changing. Hmmmm, there might be something to that...