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2-PK 5/16" End Mill 3-PK 5/16" End Mil l NEW!! High Performance End Mill Upgrade For The Newest 80% AR15 Lower Receiver Jigs SPECIFICALLY FOR THESE JIGS: 80 Percent Arms Easy Jig Gen-2 (any version) 5D Tactical Universal AR15 / AR9 5D Tactical Universal AR10, .308. End Mill Dimensions: 3 flute 5/16" Diameter 1/2" Length Of Cut …