A 908 will not necessarily fit in a holster for a 3913. The blocky slide of the 908 is larger than the 3913 slide, and will not fit into a tight holster. My 908 will not fit the Galco shoulder rig I used for my S&W #469, which roughly shared the same slide contours as the 3913. I use a Don Hume belt slide for my S&W #908.