Upper receiver comes stripped without ejection port cover, forward assist or rear sight. Billet from 7075 aluminum that has been T6 and hard coat anodized (Mil-A-8625A) with DFL. Features an A1 style fixed carry handle and shell deflector. These do have M4 feed-ramps.
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I've not built it to completion so I can't remark on much more that the initial fit and feel of this chunk of metal, however I'm very pleased with it so far. Hope to torture it very soon.