The Old West: Advice Appriciated

[xguild]

Hello All

I'm getting ready to run a one shot Old West adventure for a big gaming event we are having in December. I have chosen to go with a less realistic "Movie" version of the west (thing Young Guns, Tombstone).

In any case I have the 1st edition GURPS suppliment called "old west" which covers the genre quite nicely but Im not really that experianced with the differences between older versions of GURPS and version 4. There doesn't appear to be a 4th edition version (only the 2nd edition) but I guess the questions are.

How do either of these editions stack up against 4th edition? Can I just use material like Guns and Equipment out of the book. Are the Gunslinger rules and shoot out rules of 1st or 2nd edition applicable to 4th edition? Any other suppliments you might recommend?

Any advice would be helpful. Thanks in advance.