3d Print AR15 Upper Receiver

Originally posted by Alex chow on grabcad. “THX to the engineer built the original model, there is only a little modification of the model, cause the bolt-catch is different, and I closed the the gap on rail of the original model, just for a easier 3D printing. no 1:1 printing test, time killing”  Find it on grabcad here: https://grabcad.com/library/gbb-upper-reciever-replica-of-a3_ur_lite-project-1