Looking for a top quality Upper Receiver at wholesale prices? The NBS AR-15 Assembled Upper is machined by one of the foremost manufacturers of mil-spec AR-15 components in America. Normally these assembled uppers are only available to builders when purchased from a name brand at a substantial markup, but we’re making these available at wholesale prices. What makes this upper different from other “Mil-Spec” upper receivers? Machined from top tier forgings.