16″ FDE Unassembled Upper Build Kit – 15″ M-lok
$194.95
Unassembled 16″ 5.56 NATO AR rifle upper build kit in FDE Cerakote. 15″ M-LOK free-float handguard, 4150 phosphate barrel with 1:7 twist, carbine-length gas system. BCG and charging handle not included. SKU DT11-209.
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16″ FDE Unassembled Upper Build Kit – 15″ M-lok
This 16″ 5.56 NATO unassembled AR rifle upper build kit pairs a 4150 CMV barrel with a 15″ M-LOK free-float handguard on a carbine-length gas system, finished in FDE Cerakote. The barrel runs a 1:7 RH twist with a manganese phosphate finish, 1/2×28 muzzle thread, and a .750″ gas block journal. Prefer Keymod instead? See the matching FDE kit with 15″ Keymod handguard, or browse more AR-15 upper build kits in this lineup.
Specifications:
- Caliber: 5.56 NATO / .223 Wylde compatible
- Barrel: 16″, 4150 CMV, manganese phosphate finish, M4 contour, 1:7 RH twist, 1/2×28 TPI, .750″ gas block journal, carbine-length gas
- Upper receiver: Forged 7075-T6, M4 feed ramps, FDE Cerakote
- Handguard: 15″ M-LOK free-float, 6061-T6 aluminum, FDE Cerakote
- SKU: DT11-209
What’s included:
- Upper receiver
- 16″ barrel
- Handguard with barrel nut and mounting screws
- Forward assist assembly
- Dust cover assembly
- Gas block with pin
- Gas tube
- A2 flash hider with crush washer
Note: BCG and charging handle not included, available as an add-on. Ships unassembled.
| Weight | 5 lbs |
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What buffer weight should I use with a 16″ carbine-length gas setup?
A standard carbine buffer (3 oz) is the baseline for a 16″ carbine-length gas upper and works reliably with most BCGs and standard-pressure 5.56 ammunition. If you’re experiencing over-gassing symptoms — bolt bouncing, brass being thrown far, or case head separation — stepping up to a heavy carbine buffer (HSS, around 3.8 oz) or an H2 buffer (4.6 oz) can slow the bolt carrier and smooth out the cycle. For most standard builds running factory ammo without a suppressor, a standard carbine buffer runs fine without any tuning.
Does the 15″ M-LOK handguard require any modification to the barrel nut area?
No modification to the barrel or upper receiver is needed. The free-float handguard replaces the standard delta ring assembly with a proprietary barrel nut. The barrel stays exactly as installed — the handguard slips over the barrel and threads its barrel nut onto the upper receiver threads, then locks down with the appropriate wrench. No drilling, pinning, or modification to the receiver is required.
What optic mounting options does this upper support?
The upper receiver has a standard Picatinny top rail machined into the forging, which accepts any standard AR-15 optic mount — scope rings, cantilever mounts, red dot mounts, BUIS, and LPVO mounts all drop straight on. The 15″ handguard also has a continuous top rail that runs flush with the receiver rail, giving you an unbroken sight plane the full length of the handguard if needed for a longer rail-mounted accessory or extended sight radius.
Can this upper be used in a pistol configuration?
No. A 16″ barrel is a rifle barrel by federal definition. Attaching this upper to a lower with a pistol brace does not make it a legal pistol — a 16″ barrel paired with a pistol lower is still classified as a rifle and must meet rifle OAL requirements. This upper is designed for standard rifle builds paired with a rifle or carbine lower and a legal stock configuration.
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