Made a compensator for G17, G18c model airsoft guns and it might fit a G19. Tested it on a cyma cm030, upgraded marui g17 and a stark g18c. There will be thin strips above the rail insert portion, I put them on to try and incorporate the lower railed part of the compensator into the lower reciever but you can break them off if you need to. Print the front on the bottom and enable supports.