Mil-Spec upper receiver with indexing marks and M4 feed ramps. CNC machined of 7075-T6 aluminum and Type III hard coat anodized finish. Barrel material is a proprietary blend of stainless steel, cold hammer forged with 1:7 inch twist, 18 inch MK12 profile and salt bath nitride finished. MK12 low profile gas block CNC machined of 416 hardened steel with black oxide coating, rifle length and direct impingement. Daniel Defense 17-4 stainless steel flash suppressor with salt bath nitride finished. M16 profile bolt carrier group is chrome lined with properly staked gas key. No sights. Daniel Defense DDM4 Rail 12.0 handguard is CNC machined of 6061-T6 aluminum and Type III hard coat anodized. Daniel Defense Rail Panels made from Santoprene and heat resistant to 300° F. Made in the USA.