The .zip file contains .stl; .obj; .gltf(glb). This is my model, it isnt perfect and as detailed as the original piece, but it fits more tightly on hopup. Printed on Creality Ender-3 V3 KE with supports, walls 0.1mm and 15% infill but 10% will probably survive also on hyper pla. ** !!You will need to drill a hole for the spring from hopup or it will slide of!! !!Print with supports because the barrel is in the air.!!** Please be careful since the walls around hopup are only 1mm thick (like the original one) and can crack under sideways preassure. Since my outerbarrel exploded and new one costs a lot, i thought i can try to 3D print one. It doesnt intervine with internal mechanical parts worked without any issue after testing 5 magazines. I didnt test yet how much it can survive, if it breaks i will update the model and if its here after 30.5.2025 than its solid (also printing depends).