The Daniel Defense M4A1 features a M4A1 RIS II handguard CNC machined of 6061-T6 aluminum with a hard coat anodized finish. It has a chrome moly vanadium steel, chrome lined barrel with a permanently attached Daniel Defense flash suppressor. The upper and lower receivers are CNC machined of 7075-T6 aluminum with a hard coat anodized finish, while the rail panels are made from Santoprene and is heat resistant. The buttstock and pistol grip are constructed of polymer with a Soft touch overmolding. This model has a 14.5" barrel with a heavy phosphate coating, FDE finish handguard, and black receiver. Oal 31.50"- 34.75" Hand Right Hand Twist 1:7" Action semi-auto Muzzle Flash Suppressor Safety Ambidextrous Series M4A1 Sights Optic Ready Weight 6.74 lbs Caliber 5.56x45mm Trigger Mil-Spec Capacity 30+1 Weight Range 6 lbs to 6.99 lbs Barrel Length 14.50" Receiver Material 7075-T6 Aluminum Stock Description 6 Position w/SoftTouch Overmolding Barrel Description Chrome Lined Steel Metal Finish Group Blued/Black Stock Finish Group Black Barrel Length Range 14" to 14.99"