Daniel Defense AR-15 MK18 Pistol Upper Receiver Assembly 5.56x45mm 10.3″ Barrel

Product Overview
The Daniel Defense MK18 Complete AR-15 Pistol Upper Assembly is a faithful recreation of the US Navy’s Mk18 Mod 1 platform, and features a Premium 10.3″ Cold Hammer Forged Barrel made from Mil-Spec 4150 Chrome-Moly Vanadium Steel that is Chrome Lined for durability and corrosion resistance. M4 feed ramps are incorporated into the barrel extension and upper to enhance reliable feeding, while a true 5.56×45 NATO chamber ensures that both commercial and higher pressure surplus mil-spec ammunition may be safely used. The bolt and carrier both pass a thorough Magnetic Particle Inspection (MPI) test for guaranteed structural integrity, and the gas key is properly staked to its mil-spec bolt carrier. All steel parts feature a heavy Mil-Spec Phosphate finish for superior corrosion resistance and durability, while aluminum parts are Type III Hard Coat Anodized.
This upper comes equipped with a 9.5″ Flat Dark Earth RIS II Mk18 Quad-Rail Handguard that covers a pinned, low profile gas block at the carbine gas port position and Free Floats the barrel for increased accuracy potential. The RIS II provides ample room for adding tactical accessories, while also creating a full length, uninterrupted top rail surface with the A4 Flat-Top receiver that can accommodate a shooter’s chosen optic and/or iron sight arrangement. Complete with charging handle assembly and Daniel Defense Flash Hider, the MK18 upper is ready to drop onto any pistol or registered SBR small pin lower receiver.

Notes:

An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.

Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.

Features

Mil-Spec Upper with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
Chrome Moly Vanadium Steel Barrel, Cold Hammer Forged, 1:7 Twist, 10.3″ Government Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement
Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished
M16 Profile bolt carrier group, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key
Daniel Defense RIS II MK18 Handguard, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized
Daniel Defense Rail Panels Made from Santoprene, Heat Resistant to 300° F

Specifications
Product Information
Cartridge 5.56x45mm NATO
Finish Black
Material Aluminum
Weight 3.71 Pound
Barrel Length 10.3 Inches
Twist 1:7 Inches
Threads 1/2″-28
Barrel Contour Government
Sights No
Barrel Finish Mil-Spec Heavy Phosphate
Chrome Lined Yes
Gas Block Diameter 0.75 Inches
Gas System Length Carbine
M4 Feed Ramps Yes
Upper Receiver Type A3 Flat-Top
Barrel Material 4150 Chrome Moly Vanadium Steel
Handguard RIS II Mk18 Quad Rail, Free Float
Bolt Carrier Assembly Included Yes
Muzzle Device Daniel Defense Flash Hider
Mil-Spec or Commercial Mil-Spec
Compatible With
AR-15
Delivery Information
Shipping Weight 4.995 Pounds