We aren't gunfighting and you are correct there is no 5" barrel USFA. Again, there ain't bug snots worth of difference between a 4 3/4" and a 5 1/2". There's a big difference if you go to a Sheriffs length 3" or the long barreled 7 1/2". Not sure exactly what BB meant about "gunfighting" and "fighting" gun. If he is talking about the SASS Gunfighter category, people use all barrel lengths depending on personal preference. Best thing for you to do is go to a gun store or look at some friends guns in the caliber you intend to buy and pick the one that balances best for YOU. Differences in draw speed and muzzle velocity aren't really the deciding factor since 3/4" makes no practical difference in either.