What's in the Box Daniel Defense MK18 5.56mm AR-15 Pistol 30 Round Magazine Owner's Manual The DANIEL DEFENSE MK18 5.56mm NATO AR-15 Pistol is unmatched in size, weight, and performance, and features the picatinny quad rail Daniel Defense provides to USSOCOM. The RIS II picatinny quad rail features a Bolt-Up System that has been rigorously tested prior to fielding by USSOCOM. The 10.3 inch Cold Hammer Forged barrel is the same length in use for the MK18 upper most commonly used for CQB operations. The independently ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters. This rifle also comes with the ergonomic Daniel Defense Buttstock and Pistol Grip. Firearm Features LOWER RECEIVER: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Government Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 Hardened Steel and Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement MUZZLE DEVICE: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished BOLT CARRIER GROUP: M16 Profile, MP Tested, Chrome Lined, Properly Staked Gas Key HANDGUARD: Daniel Defense MK18 RIS II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized RECEIVER EXTENSION: 6 Position Mil-Spec 7075-T6 Aluminum BUTTSTOCK: Daniel Defense Buttstock, Glass Filled Polymer with Soft Touch Overmolding PISTOL GRIP: Daniel Defense Pistol Grip, Glass Filled Polymer with Soft Touch Overmolding Firearm Specifications Manufacturer: Daniel Defense Model: MK18 Caliber: 5.56 NATO Barrel Length: 10.3" Overall Length: 28.75" Twist Rate: 1:7 Finish: Burnt Bronze / Brown Sights: None Grips/Stock: Magazine Capacity: 30