The silencers for the MP40 and the sniper rifle (can't remember what it's called), and the bayonet for the sniper rifle. Seeing as I use these 2 weapons almost exclusively, are these upgrades worth it?

hmm i played this game like a thousand years ago so i dont remember

Damn. Well, thanks anyway man. I just got it from the bargain bin, so it's new to me.

You'll want to upgrade everything on the STG, but the silencers are worth it for those guns.  Skip the bayonet.

The bayonet is great. It's not practical at all, but it produces some truly horrifying results when you stab a guy in the throat with it. I recommend it for the lulz factor alone.

STG?
 
Edit: Never mind, I just wiki'd STG.