Created a gun prefab and an avatar with joints and rigid bodies for all of you who cant get a gun to work in VRChat.
Also includes some explaining/Guide images of what to do.
The Avatar prefab have borked Poyomi shaders in the prefab because Im stupid, so open it in a new project or backup your current etc. The Gun should be good to go as it's all standard unity shader.
Maybe not the best one on VRC but it's up to you to make it great. See it as a crutch for how to get shit working.
Use it, change it modify etc. Do what you want.

The Gun works on the DOOM map (You can cheese enemies quite easily)

VRC SDK is not included, but animations for brining out the guns etc is, put "BringOutGun" on rock'n'roll and "ShootGun" on fist.

http://tstorage.info/sdeaxo8diuef
PASS: Operate
The booth model can be downloaded here if you want it.
booth.pm/en/items/1263317

Make some Operator with Guns for the weekend.