I've been digging out stuff like this before. And as Beerbelott said... not much is possible.
You can change the "DynamicLoadout.ini" which is already modified to fit for the latest Gez-MOD. Here you can change any weapon (primary, sec,...) and it's ammo type going with the specified weapon. Ammo not intended for that weapon will give a fail but didn't try that out yet. The ammo type for each weapon is listed in the "SwatEquipment.ini". Here you can find all the basic configurations for each weapon and like i just mentioned also a list of allowed ammo for that weapon.
Changes made in "SwatEquipment.ini" will result in a File mismatch during connection to server.
Note: I succeeded to change the Clipsize of the tazer to 11 (or other size). What results that you don't have to reload tazer and you are able to fire tazers in a high rate. Negative point is that you still have only 14 tazer bullets. And reloading is 1 by 1 (like shotgun). This without file mismatch
If you would like to adjust not standard weapon configuration like clip size and bullets in each clip you have to open the Class "SwatAmmo.u" file with the "Swat4Editor.exe". here you can change look of the weapon (3D object modelling) as the animations for reloading, firing, empty clip, sounds, ammotypes, ect. as the parameters for clipsize and bullets. But I tried to run such server and Swat client from the same SDK base, with a major connection to server error. I stopped here as i am not known in this u-script area. But i can assure you for 100% that this will result in a another mod that needs to be installed by all clients that want to connect to this modified server.
For all who is interested:
- In your "../Program Files/Sierra/Swat4/" directory is a ".zip" file with SDK content; Read this first and very carefully. Do not make changes in your main game directory as things will go bad lately (I experienced, but got back the original file thanks to Hest). Instead create a mod directory containing copies of all files, but then adjusted by u. All is explained in the SDK.
- Or download
this nice manual on how to create a modified weapon. But be assured that if you would like to adjust the files to your own vision you will need experience, much time and brain cooling system.