Difference is the Spartan IV has a bull barrel, FLGR, and 4.25inch. Ruger as everyone already knows is 100% US made and is made out of barstock steel from slide to barrel/barrel bushing so it's a tight high quality fit. I really don't care as far as size goes but I will be carrying this pistol. As far as reliability and performance goes what do you guys think? Should I wait for something better or go with either one of these aforementioned pistols? Wanna kill these ads? We can help!