Luth-AR 11.5 in Light Weight Complete Upper Barrel Receiver Assembly - 5.56 1x7 twist M-LOK Free Float Handguard Black 11.5
$408.89 at OpticsPlanet · 2 stores
In stock Sale
Luth-AR 18 in MARK12 Complete Upper Barrel Assembly MLOK Black 18
No ratings yetBest price
$432.35at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
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- Luth-AR 11.5 in Light Weight Complete Upper Barrel Receiver Ass… $408.89at OpticsPlanet
- Luth-AR 16 in Light Weight Complete Upper Barrel Receiver Assem… $394.75at OpticsPlanet
- Rock River Arms Completed Upper Receiver Left Handed RAGE .223/… $439.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $432.35Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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Price history
Dashed line = out of stock. Tracking since Oct 15, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $432.35 | $432.35 | $432.35 |
Since Oct 15, 2026.
About this part
The Luth-AR 18 in MARK12 Complete Upper Barrel Assembly MLOK Black 18 is an AR-15 complete upper receiver from Luth-AR. One store lists it, OpticsPlanet at $432.35.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 18" · Handguards
Specifications
- Manufacturer
- Luth-AR
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Luth-AR 18 in MARK12 Complete Upper Barrel Assembly MLOK Black 18. The barrel is made of 4140 Chrome Molly providing accuracy and durability. The 1-9 twist rate is optimized for stabilizing heavy projectiles. This assembly includes a Picatinny rail for mounting optics and accessories. Easy to install and use. Designed for serious shooters this assembly is built to provide exceptional performance and reliability. Starts with our 18 in 5.56 Mark12 barrel made from 4140 Chrome Molly with a 1-9 in twist mated to our A3 Flattop receiver which includes our bolt carrier charging handle forward assist and ejection port cover. The upper is then topped off with our lo-profile gas system and our ergonomic 15 in Palm Handguard with KeyMod or M-LOK slots and a Picatinny top-rail. Specifications for Luth-AR 18 in MARK12 Complete Upper Barrel Assembly MLOK: Manufacturer: Luth-AR Caliber: .223 Remington Barrel Length: 18 in Color: Black Gun Rail: M-LOK Magazine Included: No Country of Origin: USA Package Contents: Luth-AR 18 in MARK12 Complete Upper Barrel Assembly MLOK Luth-AR BAA3-M12M: 18 in MARK12 Complete Upper Barrel Assembly MLOK Black 18
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