Finally get a quality, true-to-form reproduction M16A1 Upper Receiver for a fraction of the cost. These are machined from 7075-T6 forgings specifically designed to have the correct proportions and profile of the original M16A1 Upper Receiver. Machine work is performed by true craftsmen with careful attention to detail. These uppers are finished with Mil-Spec type 3 hard anodizing which has the best likelihood of matching most mil-spec forged lower receivers. This is the proper upper to use for the following reproduction builds: XM16E1 M16A1 Model 607 Model 609 (XM177E1) Model 619