I take it you have the hud_icon.dds file in the same folder. Save as DXT3 compression.
Also in the gunspec.txt file there are these lines.
;// GUN HUD (0-colt,1-magnum,2-uzi,3-shotgun,4-rifle,5-rpg)
statuspanelcode = 100
Not really sure the significance of the 100. But I have noticed in custom weapons gunspecs they have this code in them.
This is in the cartoon ray gun in the easter pack. A little more details.
; GUN HUD (0-colt,1-magnum,2-uzi,3-shotgun,4-rifle,5-rpg,6-grenade,7-bow,8-mace,9-stone,10-sword,11-staff)
statuspanelcode = 11
Hope this helps more.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.