Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver Chrome-Moly Barrel Black Finish M-LOK Free-Float Handguard
$1,225.50 at OpticsPlanet
In stock Sale
Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver Chrome-Moly Barrel Flat Dark Earth Finish M-LOK Free-Float Handguard
Mitchell Defense · Upper Receiver
No ratings yetBest price
$1,225.50at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver C… $1,225.50at OpticsPlanet
- Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver C… $1,225.50at OpticsPlanet
- Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout… $1,255.50at MidwayUSA
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $1,225.50Salechecked 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 | $1,225.50 | $1,225.50 | $1,225.50 |
Since Oct 15, 2026.
About this part
The Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver Chrome-Moly Barrel Flat Dark Earth Finish M-LOK Free-Float Handguard is a 10.3" 300 Blackout upper receiver from Mitchell Defense. One store lists it, OpticsPlanet at $1,225.50.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 10.3" · Handguards
Specifications
- Manufacturer
- Mitchell Defense
- Color
- Flat Dark Earth
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver Chrome-Moly Barrel Flat Dark Earth Finish M-LOK Free-Float Handguard. 3in .300 Blackout Upper Receiver is optimized for suppressed and unsuppressed reliability with both subsonic and supersonic ammunition. The billet 7075-T6 upper includes a thermal-fit barrel seat that enhances barrel alignment and accuracy. The 10.3in barrel offers balanced rigidity and reliable ballistic performance. A standard adjustable gas block allows fine-tuning of cycling behavior to match suppressor setups or load variations. The ArmorLube Carbon Cutter BCG with Carpenter 158 HP/MPI bolt improves reliability and reduces fouling. A free-float M-LOK handguard provides versatile accessory mounting. Finished in E-Series Cerakote. Specifications for Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver: Manufacturer: Mitchell Defense Caliber: .300 AAC Blackout Overall Length: 21 in Barrel Length: 10.3 in Barrel Profile: Standard Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: Non Threaded Muzzle Device: A2 Flash Hider Finish: Nitride Gun Model: AR-15 Fabric/Material: 4150 CrMoV Gun Make: AR Platform Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Country of Origin: USA Features of Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver Adjustable gas block enables precise tuning for ammunition and suppressors Thermal-fit billet upper enhances stability and accuracy ArmorLube Carbon Cutter BCG with C158 HP/MPI bolt ensures dependable cycling M-LOK handguard provides lightweight modularity Package Contents: Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver What firearm models does the manufacturer say Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver is compatible with? The manufacturer says that Mitchell Defense The DOC AR-15 .300 BLK 10.3in Upper Receiver is compatible with AR-15Mitchell Defense 421221: The DOC AR-15 .300 BLK 10.3in Upper Receiver Chrome-Moly Barrel Flat Dark Earth Finish M-LOK Free-Float Handguard
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