Summary This is a baseplate designed to fit the 16 round cz75 and mec gar magazines. It is not a + extension; just a copy of the extended pad that CZ makes. Edit: I added a version with less material between the lip on the magazine and the frame. Some of my mags wouldn't go in the frame far enough to reach the mag catch with the original version, but not all of them. You can check to see which version you need by inserting a magazine without the base pad on it and measuring the distance from the top of the magazine lip to the frame. If it is around 1mm, you will need the thinner version. If it is around 2mm, use the original model. Print Settings Printer Brand: SeeMeCNC Printer: Rostock MAX Rafts: No Supports: Yes Resolution: .2mm Infill: 100% Notes: I would suggest ABS, Nylon, or Polymax filament because good layer adhesion is needed, so make sure you know your printer if you want these to function and be reliable. I used ABS at first and although I had no issues, I now switched over to Taulman Bridge and they feel much tougher. I think they will last much longer using nylon over ABS.