5.56 16″ FDE Upper slim 15″ M-Lok Rail


Upgrade your AR-15 with our 5.56 16″ FDE Upper, featuring a 15″ slim M-Lok rail for enhanced accessory attachment. This Mil-Spec upper, coated with durable Flat Dark Earth Cerakote, offers a 1×7 twist button rifled barrel made of 4150 steel, nitride-coated for precision and longevity. Designed for .223/5.56 M4 compatibility, it’s ideal for custom builds.

Product price: $204.95
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16″ AR-15 Upper Flat Dark Earth, No Bolt Carrier Group, 15″ Slim Matching FDE M-lok Hand guard Rail

Our 5.56 16″ FDE Upper being with a AR-15 military upper receiver and 15″ M-Lok rail and all AR parts are coated with Flat Dark Earth From Cerakote Gun Coatings by a local Certified Applicator for a lasting strong finish on the AR-15 Upper and M-Lok Handguard. It also has USA made made accessories such as a dust cover, forward assist, flash hider and barrel. The barrel is button rifled at a 1×7 twist rate and nitride coated for longevity and accuracy. This upper has a M-Lok free float rail system that allows use of many accessories from different manufactures across the country.

Features of the 5.56 16″ FDE Upper 15″ M-Lok:

  • Flat Dark Earth Upper and Handguard
  • Chamber – .223/5.56 M4 Feed Ramp (will shoot both 223 and 5.56)
  • Barrel Twist – 1 x 7 twist Button Rifled
  • Thread – 1/2″ x 28rifle thread pattern
  • Barrel Steel 4150 with Black Nitride processed
  • Flash Hider – A2 Bird Cage Flash hider
  • Handguard – 15″ Flat Dark Earth Slim Free Float M-lok Rail
  • Gas Block – .75 Low Profile Gas Block
  • Upper Receiver – Flat Top M4 Flat Dark Earth Upper
  • Bolt Carrier Group – Not Included
  • Charging Handle – Not Included
  • Approx. Weight – 4 pounds
  • Made in the USA
  • SKU: DT11-083


Daytona Tactical test fires every custom AR-15 upper to verify cycling. We do not guarantee cycling with all 5.56/.223 ammunition due to vast differences in the quality of ammunition. Will only warranty cycling with US made ammunition. We can not warranty cycling of the AR Upper with imported, steel cased or reloaded rounds.

Additional information

Weight 9 lbs


Barrel Length

Barrel Chamber

Barrel Twist

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Barrel Material

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Barrel Gas System

Gas Block Diameter

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Accessory Attachment Style


1 review for 5.56 16″ FDE Upper slim 15″ M-Lok Rail

  1. 3 out of 5

    Mark (verified owner)

    I ordered this in March of 2022. It is a very nice assembled upper for the price. However, I should not have added the the BCG and charge handle option. The charge handle is mil spec and works perfectly. The BCG looked good on the outside but was rusted/corroded internally. It would not cycle a round. Spend the money on a good BCG instead of having a paperweight like me.

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