made this as a replica of a rail i had but i needed a larger hold to hold electrical accessories in grip mounted to it. the 2 screw holes are a little different than one of the keymod rails i have. but it does fit on my gun. not sure if keymods are different or not but this works perfect on my airsoft replica. i printed at 15% infill and seemed ok but when i tightened the screws tight it did break the screw through the hole. when i printed at 100% infill it gave it nice weight and im not able to tighten the screws tight without problems. u can try different infills. it was made in blender.