"...the regular ones..." Military muzzle loaders were the 'regular ones'.
"...kind of like today with sport rifles and military rifles?..." Yep. Kentucky(usually small calibres, .45 and under) and Hawken(large calibres .50 calibre and up) styles were custom made for the most part. Then as now, military firearms had no decoration and until the U.S. Civil War(always say, "Which one?" when hearing one of our Southern Cousins says, "The Civil War."), were smooth bores.