P90 upper receiver - airsoft

P90 upper receiver. Uses all original parts and works like the factory receiver. Main difference is plastic vs metal weight. I printed it in PLA and works just fine. Survived 3 games already and there are no signs of degradation. If you are worried use petg or some fancier material, but anything will do. Only one .stl, just select the model and click separeta that way all of the different parts will become single. Main part needs inner support. The 2 fangs need support. The optics are on the top. The top rail is really low soo you will need riser, but this will give you the option of perfectly adjusting height. I welded the rail to the main part with soldering iron for better rigidity.