Missing Shims in a gearbox
 

If your gearbox is missing 1 shim, is it still ok to shoot a couple of clips through it or no? My friend who helped me fix my gearbox told me it was ok, but I'm just making sure before I take it out for a spin. My gearbox is a version 3, so does it matter?

Just making sure...

It's not how many shims you're missing, it's whether your gears are properly shimmed. Improperly shimmed gears, such as when you're missing some, can cause gear damage.

So in other words I shouldn't be using my gun until I get it properly shimmed

That's the best idea.

Unless it's shimmed properly already, in which case go right ahead.