Product Description
Billet M16 Upper Receiver from USGI Contractor, Model 635, Black Type 3 Hard coat Mil Spec Anodized with DFL, 7075 T6, comes with port door
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A1 9mm upper is excellent
Very nicely machined and finished, with dry lube applied on the inside. If you want an A1 retro style 9mm upper it probably doesn’t get any better than this.