This is something that I 3D printed because I ran out of lead ammunition for my .22 caliber airgun. I later edited it for .177 caliber as well. When these were first tested, they sounded like real firearms because the bullets were so light that they broke the sound barrier. They fly extremely fast but slow down quickly. They are not very accurate due to their weight, size, and because they are not seamless, limiting them to close-range shooting only. PLEASE BE CAREFUL BECAUSE 3D-PRINTED AMMO IS INACCURATE AND CHEAP, AND CAN BREAK INTO SMALL PIECES WHEN COMING IN CONTACT WITH HARD OBJECTS. ALTHOUGH RARE, BE CAUTIOUS OF RICOCHETS. THE DESIGNER IS NOT RESPONSIBLE FOR ANY INJURIES FROM THIS MODEL.