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7.5" .300 BLK AR-15 Complete Upper
7.5″ 4150 Medium barrel. 7″ M-LOK handguard.
SKU OH-CU06UPC 850078799333
- Limited Lifetime warranty
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- Limited Lifetime Warranty
- Made in the U.S.A.
Build details
- Barrel7.5″ .300 BLK barrel, Medium profile, 4150, 1:7 twist, 5/8x24 thread
- Gas systemPistol
- Handguard7″ free-float M-LOK
- BCGM16 Black Nitride bolt carrier group, installed
- Charging handleStandard charging handle, installed
- FitsAny mil-spec AR-15 lower receiver
- Test firedEvery upper is test fired before it ships
Specifications
| Caliber | .300 BLK |
|---|---|
| Barrel length | 7.5 in. |
| Barrel profile | Medium |
| Barrel material | 4150 |
| Twist rate | 1:7 |
| Muzzle thread | 5/8x24 |
| Gas system | Pistol |
| Handguard | 7 in. M-LOK, free-float |
| Bolt carrier group | M16 Black Nitride (included) |
| Charging handle | Standard (included) |
| Fits | Mil-spec AR-15 lower receivers |
| Manufacturer | One Horse |
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Complete upper questions
Will it fit my lower?
Yes. It is built for any standard mil-spec AR-15 lower receiver.
Do I need an FFL to buy it?
No. A complete upper is not the serialized part, so it ships straight to you. Check your state and local law before you order.
Does it come with a BCG and charging handle?
Yes. An M16 Black Nitride BCG and a standard charging handle come installed. You can upgrade the BCG or charging handle in the add-ons above.
What ammo does it take?
It is chambered for .300 BLK. It runs both supersonic and subsonic loads.
Is there a warranty?
One Horse makes this upper and backs it with a limited lifetime warranty. See warranty details.
Dealers: Carry One Horse
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Made in the U.S.A.
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7.5″ .300 BLK AR-15 Complete Upper
MSRP: Original price was: $349.99.$319.99Current price is: $319.99.
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Description
Master close-quarters performance with this ultra-compact 7.5″ .300 Blackout Complete Upper Receiver. Featuring a 7.5″ barrel with a 1:7 twist rate, this upper ensures optimal stabilization for both subsonic and supersonic rounds, making it perfect for tactical, suppressed, or AR15 pistol builds. The 7″ M-Lok handguard provides a lightweight, modular platform for mounting accessories, while the nitride-finished bolt carrier group delivers smooth cycling, enhanced durability, and low maintenance. Complete with a charging handle and built to Mil-Spec standards, this upper is ready to pair with any AR15 Mil-Spec lower receiver for a seamless, high-performance setup.
- 7.5″ .300 Blackout barrel with 1:7 twist for versatile bullet compatibility
- 7″ M-Lok handguard for secure, customizable accessory attachment
- Nitride-finished BCG and charging handle included
- Made in the U.S.A
- Ready to mount on any Mil-Spec AR15 lower receiver Build your ultimate .300 Blackout pistol—add to cart now!
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