I created a model of a new weapon in Milkshape. I then unzipped pak3.pk3. I included my new model and re-zipped the pak file. I also added it to the end of bg_itemlist[] in bg_misc.c.

I've added the define for my weapon everyplace I can find, now I can't get it to appear.

Try Planet Quake they know what they're doing there... they even have their own Mod forums!

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Hi hi hi... You don't have to edit any original Q3 material to make your gun work in-game. You don't have to open any of the original .pk3 files, you just add your own and it over-writes the originals.

If you've edited any of the original Q3 .pk3s then copy and paste them from your Q3 CD and over-write whatever you've changed, because you don't need to do that and it might cause problems.

Check out http://www.polycount.com/ and download one or two of the weapons from there. See what they have in their .pk3s (note you don't have to call them pak9.pk3, call them my-weapon.pk3 or something). Do everything they've done, follow the naming conventions and add only what they've added.

Follow those conventions and you should be fine.