The Daniel Defense MK18 RIS II Complete Upper (brand part number 23-004-08013-011) is a 10.3-inch complete upper built to the specs of Daniel Defense’s well-known MK18-pattern short-barreled AR-15 platform, finished in Flat Dark Earth over a Black Phosphate barrel. It ships with a flat-top rail, giving the buyer a clean slate to run their own optic. This is an upper receiver group only, with no lower receiver included, so it is not itself a regulated firearm.

Key Specifications

• Chambered in .223 Rem/5.56 NATO, the standard AR-15 caliber with wide ammunition availability.
• Barrel length measures 10.3 inches, matching Daniel Defense’s well-known MK18 short-barrel configuration.
• Rate of twist is 1-in-7, matched to a wide range of .223/5.56 bullet weights.
• Barrel finish is Black Phosphate, a durable, corrosion-resistant Mil-Spec coating.
• Sights configuration is a flat-top rail, ready for the buyer’s choice of optic.
• Style is listed as Complete, a fully assembled upper ready to mate to a compatible lower.
• Handguard pattern is the RIS II rail system, a Daniel Defense signature quad-rail design.
• Finish is Flat Dark Earth, a popular tan color option for a desert or field-ready look.

Frequently Asked Questions

Is this bare upper itself an NFA-regulated item? No. It is an upper receiver group with no lower receiver included, so it is not a regulated firearm on its own. Installing it on a shouldered, rifle-configured lower without a registered short-barreled rifle would require ATF Form 1 approval first.

Is this a complete rifle? No, this is an upper receiver group only with no lower receiver included. It ships without an FFL transfer and needs a compatible AR-15 lower to complete a rifle.

What is the RIS II rail system? RIS II is Daniel Defense’s signature free-float quad-rail handguard system, a design the company built its early reputation on.

Buy the Daniel Defense MK18 RIS II Upper, FDE

This upper will ship as soon as it’s available from a Lubbock, Texas gun shop for your next compact AR build. Browse more complete uppers in our AR15 uppers selection.