Between myself and 2 brothers we own 6 XD 45's in Tactical, Service, and Compact. They are fine weapons (go bang every time you pull the trigger) The Service model has a 4" bbl. The Tactical has a 5" bbl. the Compact has a 4" bbl. with a shorter grip. In 9mm they also make a sub-compact with a 3" bb. They also have the XDM out that is a full size pistol, with 5" bbl. holding 19+1 in 9mm. I hope that answers your question.