The 4 inch bull barrel Mark 2's are the handiest carrying and well balanced. The stainless is a FrankenRuger. 2 of the blued ones are the Lipsey's version and the other is the Ruger MK4B. In a Simply Rugged Explorer pancake holster they carry easy. The Explorer is an open top holster but I think a retention strap is a good idea to make sure it stays put until you unsnap it