I dont know if this is true but it appears to me that the game looks for weapon ids info in the EquipResorces.dll (dont quote me on that)
try using a programe called FLEd-ids,
then just punch in the number 266756 into the ids_info box at the top of the interface and click the Get ids_info button it should come up blank in the text area.
then add the following into the text area.
<?xml version="1.0" encoding="UTF-16"?><RDL><PUSH/><TRA data="1" mask="1" def="-2"/><JUST loc="center"/><TEXT>YOUR WEAPON NAME HERE</TEXT><PARA/><TRA data="0" mask="1" def="-1"/><JUST loc="left"/><TEXT> </TEXT><PARA/><TEXT>YOUR WEAPON INFO HERE.</TEXT><PARA/><POP/></RDL>
once you have done that click the save ids_info button and your done
hopfully that will fix it...
The days of light are fading, as the sullen screams of humanities dieing dreams fade into obscurity.
Lets Go Get a Beer