I have a Blackhawk Serpa for my XD40 Service. I like it except for the one thing that all polymer holsters seem to have in common. the open muzzle end of the holster. I know someone is going to tell me the open end has a practical use. I have no idea what that might be. My problem is when I'm out in the field and I sit down, i'm always afraid that i'm going to pickup dirt and debris in the muzzle of the pistol without knowing it. does anyone know of a polymer holster with a closed muzzle end that will fit the XD?