YHM is very pleased to offer the YHM-8820 BLACK DIAMOND Specter XL. Chambered in 5.56mm" 6.8 SPC, or .300 BLK with many of their premium accessories built in. The Diamond series handguard bridges the gap between the upper receiver and hand guard and is marked for position on all 4 sides. The Diamond pattern in the hand guard reduces weight and blends nicely with their diamond fluted barrels.Features :Forged 7075-T6 Aluminum YHM Lower ReceiverForged 7075-T6 Aluminum YHM Flat Top Upper Receiver,,T, Marked Upper Receiver""16" 4140 Steel Barrel, Heat Treated to RC 25-32"YHM Diamond Fluting Improves Rigidity and Aids in Barrel CoolingYHM Phantom 5C2 Flash Hider / CompensatorYHM Specter XL (Rifle Length) Diamond Handguard (YHM-9635-DX)YHM Forearm Endcap (YHM-9484-A)YHM Low Profile Gas Block (YHM-9384)