The Daniel Defense M4A1 features the M4A1 RIS II, which has been in use by US Special Operations Command (SOCOM) for the SOPMOD Block II program since 2005.  The M4A1 features a 14.5” Cold Hammer Forged M4 Profile barrel with a Daniel Defense Flash Suppressor.
MATERIALS & CONSTRUCTION
LOWER RECEIVER: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point
UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps
BBARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 14.5″ M4 Profile, Carbine Gas System, Chrome Lined, MP tested, and Mil-Spec Heavy Phosphate Coated
CHAMBER: 5.56 NATO
GAS BLOCK: Daniel Defense MK12
FLASH HIDER: Daniel Defense Flash Suppressor
BOLT CARRIER GROUP: Mil-Spec MP Tested, Properly Staked Gas Key
BUFFER: H Buffer
SIGHTS: Sold Separately
HANDGUARD: Daniel Defense M4A1 Rail Interface System (RIS) II, FDE
BUTTSTOCK: MAGPUL MOE Buttstock & Mil-Spec Receiver Extension
MAGAZINE: MAGPUL 30-round PMAG
WEIGHT: 6.55 lbs
LENGTH: 31 ½” (Collapsed)
CASE: Comes with Custom Daniel Defense Full-Latch Impact Plastic Case