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Team Fortress Classic Hints
How do I upgrade this sentry gun?
1 of 6: The engineer has a very important tool in his arsenal.
2 of 6: That tool is his wrench.
3 of 6: Use it on the sentry gun to bring up an upgrade menu for your gun.
4 of 6: Some items may be greyed out or unavailable. This probably means that you aren't carrying enough resources.
5 of 6: Your resources are in the form of excess armor.
6 of 6: Run back to a respawn room and grab all of the armor packs. You should have enough to do whatever you want now.
