This is a custom Streamlight TLR-7 1913 Key made to fit the Canik MC9. I started by modeling a 1913-4 key and creating a fusion 360 model with a movable rail which I listed as a custom file. This custom file can be modified to change the rail position to any spot that is needed to fit your light. I uploaded a 1913-4 and 1913 Canik MC9 STL. The fusion 360 files are welcome to edit and remix as well as the custom file. After some good advice and testing (Shoutout to the Canik Reddit Community) PETG and Nylon would be the preferred material for this key. Supports are required. If this key does not fit with your printer settings, I suggest using the horizontal expansion setting in your slicer. +/- .1mm would likely all that would be required.