Mil-Spec upper receiver with indexing marks and M4 feed ramps. CNC machined of 7075-T6 aluminum and Type III hard coat anodized. Pinned low profile gas block is CNC machined of 4140 hardened steel, Mil-Spec heavy phosphate coating, carbine length, direct impingement. Features a 14.5 inch cold hammer forged M4 profile barrel with a permanently attached Daniel Defense Improved Flash Suppressor to meet the NFA required 16 inch length. M16 Profile bolt carrier group is chrome lined with properly staked gas key. No sights. Daniel Defense M4A1 Rail Interface System (RIS) II handguard is CNC machined of 6061-T6 aluminum, Type III hard coat anodized flat dark earth. Daniel Defense Rail Panels made from Santoprene, heat resistant to 300° F. Made in the USA.