Ring of plastic to fill the gap between bottom of grip well and the CZSP01-40 magazine baseplate. Comfortable and stops pinching of fingers due to vibration. Source code included, if you want to modify to fit similar magazines. Print in ABS or PLA. Color may be selected to identify your magazines, or print in the default of plain black. No support needed, but stay with 0.25 mm layer height or less and 2 vertical shells. 20% fill is adequate. Edges will need to be smoothed lightly, to remove any excess width in the first printed layer. Printed part should push onto the magazine without pressure, but tight enough to avoid any movement. The basic format can be adjusted by rotating the grip angle and cylinder, to fit other magazine combinations. Two cubes are used to trim the overall height, for simple OpenSCAD coding.