The Daniel Defense MK18 SBR 5.56 NATO in FDE is the company’s factory-built short-barreled rifle on the MK18 pattern, complete with the Daniel Defense buttstock and pistol grip (Daniel Defense part no. 02-088-17024). Its 10.3-inch cold hammer forged barrel is the same length used on the MK18 uppers most commonly run for close-quarters work, and it sits under the RIS II picatinny quad rail that Daniel Defense supplies to USSOCOM. The rail’s Bolt-Up System was rigorously tested by USSOCOM before fielding, so lights, lasers and grips have solid attachment points. An independently ambidextrous GRIP-N-RIP charging handle works for left- and right-handed shooters, and the receivers are machined from 7075-T6 aluminum with an enhanced flared magazine well. Made in the USA, it is a compact, stocked carbine for home defense, training and anyone who wants the MK18 set up the way it was designed.

Key Specifications

• The chambering is 5.56mm NATO, the cartridge the MK18 pattern was designed to run.
• Barrel length is 10.3 inches, the close-quarters length that keeps the rifle maneuverable in hallways and vehicles.
• The barrel is cold hammer forged chrome moly vanadium steel with a chrome-lined bore, Mil-Spec heavy phosphate coated and HP/MPI tested for service life under sustained fire.
• Rifling twist is 1:7, a fast rate that stabilizes the heavier 5.56 bullet weights.
• The gas system is carbine-length direct impingement, fed by a pinned low-profile gas block machined from 4140 hardened steel.
• The muzzle is threaded 1/2×28 TPI and wears a Daniel Defense flash suppressor in salt bath nitrided 17-4 PH stainless steel.
• The handguard is the Daniel Defense MK18 RIS II, machined from 6061-T6 aluminum and hard coat anodized, with Picatinny rails on all four sides.
• The bolt carrier group is M16 profile, MP tested and chrome lined with a properly staked gas key, running on an H buffer.
• Weight is 5.88 pounds, light for a fully railed carbine.
• Overall length runs 26 3/4 to 29 7/8 inches with the muzzle device, set through the 6-position Mil-Spec receiver extension.

Frequently Asked Questions

Does the MK18 SBR come with sights? No. Daniel Defense lists sights as sold separately, so plan on an optic, iron sights or both for the flat-top upper and the RIS II top rail.

What comes with the rifle? Daniel Defense ships it in its full-latch impact plastic case, and the RIS II rail comes with three low-profile Santoprene rail ladders that are heat resistant to 300° F.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for short-barreled rifles. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply. Taking an SBR across state lines still requires an approved ATF Form 5320.20.

Buy the Daniel Defense MK18 SBR 5.56 NATO, 10.3-Inch Barrel, RIS II, FDE

As of October 9, 2026, this short-barreled rifle transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through Daniel Defense’s short-barreled rifle lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.