This simple modification to the FloatingX LUA script file adds an ammunition counter to the Alien Weapon using the M1A1 FloatingX HUD. In keeping with the style of the FloatingX HUD, the ammo counter jitters and flickers back and forth to mimic the static effect seen when the Alien Weapon is selected.
To install, download the M1A1 version of the FloatingX HUD plugin, back up the FloatingX.lua script file inside, and replace it with this one.
Simple code change to the FloatingX.lua file included with the M1A1 FloatingX HUD.