The bull barrel (all steel) Mark IV will not be light like the Lite model. That might be mor to your liking, then all your mags would be the same. You can usually pick Mk IV barrels up from Volquartsen for cheap, as mentioned above.My wife likes her Ruger Mark IV 22/45 Lite because it is lighter than my Buck Mark Black Medallion. I like the Buck Mark because it is heavier.