Upper Reciever

modified version of some one else's model. Reinforced the area below the ejection port and removed the fragile hinge attachments for the ejection port cover. Ejection port size was also reduced from the typical size. This is for replica or airsoft use only. I did not have the stp file. so the modifications arent as clean as id like, but a print should come out just fine. As i find the time, ill continue to make changes and improve on the original base file. I'll also be posting a version with a