Harnmaster rule set
 

If the MP 4th rules weren't used, I would use the Harnmaster Core rules. Excellent for mundane things like negotiating, huunting, etc. Firearms and explosive rules would have to be developed. Easy enough though.

Rob, you may want to throw some questions at Targan (who is on the Twilight: 2000 forum). He ran a Twilight: 2000 game for some years using a Harnmaster set of rules updated for firearms. The system was created by Bill Gant and called Gunmaster.
His website is defunct now but it can still be visited at: -
https://web.archive.org/web/20080217...index.html#GMG

I tested a few of the links on the archived page and they still work so I am assuming that they all work. It appears that all the basic info you may want is on that page.
However, if you want to discuss it with someone who actually ran it, then Targan is the person you want to talk to.

Out of curiosity. What are tweaks folk have made to their games rules wise? As at its core I rather like 4ths rules but I keep feeling like it is either lacking something or needs to be pared down on some aspects. Maybe that's me being from that newer school of rpgs but I keep thinking of little tweaks and changes that could be done.

Also does anyone have any advice for running the game using t2k 2.2?

So has anyone used the new edition of twilight 2000 for a game yet?

Yes, I did a single scenario as a prequel to "Escape from Kalisz" in 2-3 sessions. I introduced the setting, we had a couple of encounters and fights and some hard decisions to make. In the end, we narrated the demise of the 5th ID and talked about it.

End of this month, we're going to meet for a proper session 0 for a full campaign.