Files and Utilities for creating weapons

See files attached.

INF_Hands: 3dsmax 9 skeletal rig and model for first person INF hands.

ActorX: 3dsmax plugin to convert your models and animations into .PSK and .PSA files for use with the engine.

ActorXImporter: Reverse plugin of ActorX. Imports .PSK/.PSA files into 3dsmax.

umodel: Extracts models from .u files.

The hands are saved with 3dsmax 9, so you will need version 9 or higher to open it. If you have a higher version, you can find the right version of ActorX at http://udn.epicgames.com/Three/ActorX.html#ActorX%20Exporter%20Plug-ins
More on how to use these.. maybe later.

What exactly did you try?
What I suspect is that you probably didn't add the correct editpackages in UnrealTournament.ini.
If you're making INF weapons you should have the following packages listed in UnrealTournament.ini under [Editor.EditorEngine]:
EditPackages=INF_Assets
EditPackages=INF_Assets2
EditPackages=INF_Assets3
EditPackages=INF_Core
EditPackages=INF_Bonus

And then add your mutator package at the end. You don't necessarily need the assets packages, but those contain the weapon sounds if you need to recycle some. INF_Bonus has some useful weapon related functions as well that you might want to use. INF_Core is required without question. The order is important because it determines the order in which the code is compiled, and therefore inheritance. (If you don't understand this you're in trouble.)

Also, you're going to want to recompile a copy of INF_Core.u and INF_Bonus.u otherwise you'll get compilation errors about missing files and the process will break.
Read the stickied thread in Infiltration Development, 2.9 mutator compiling post #12 on how to do that.