Black Diamond Specter Upper Receiver

Complete Flattop Upper With High-End Features

Flattop upper comes with high-end custom features and accessories already installed, ready to snap on the mil-spec lower receiver of your choice. Comes fully assembled with bolt/carrier, charging handle, tactical handguard, gas block, and barrel.Features a free-floated Diamond handguard with uniquely-patterned holes machined between the rails to reduce weight and enhance barrel cooling. Four full-length MIL-STD 1913 Picatinny rails have individually marked slots for quick reference. The handguard bridges the gap to the front of the receiver to form one continuous, uninterrupted top rail; extends over the low-profile gas block for a smooth, streamlined appearance. Specter Upper features Specter-length handguard; Specter XL Upper features a rifle-length handguard. Chrome-lined, 16" barrel has a unique diamond-pattern fluting that increases surface area for superior cooling. 1-9" rifling twist works with a wide variety of bullet weights. 5.56 NATO chamber accepts commercial .223 or mil-spec 5.56mm ammunition. Also includes a Yankee Hill Phantom 5C2 flash suppressor/compensator, plus YHM-9383 low profile gas block, YHM-9627 flip-up front sights, and YHM-9680 windage-adjustable flip up rear sight with A2-style long and short-range apertures.