Home › Complete Uppers › 10.5" .300 BLK Complete Upper
10.5" .300 BLK AR-15 Complete Upper
Built To Run™. 10.5″ 4150 Medium barrel. 10″ M-LOK handguard.
SKU OH-CU05UPC 850078799326
- Limited Lifetime warranty
Add to cart
Loading price and options…
- Limited Lifetime warranty
- Ships in 2-3 business days
- Made in the U.S.A.
Questions before you buy? Call 812-200-0305 or email [email protected].
Build details
- Barrel10.5″ .300 BLK barrel, Medium profile, 4150, 1:7 twist, 5/8x24 thread
- Gas systemPistol
- Handguard10″ free-float M-LOK
- BCGM16 Black Nitride bolt carrier group, installed
- Charging handleStandard charging handle, installed
- FitsAny mil-spec AR-15 lower receiver
Specifications
| Caliber | .300 BLK |
|---|---|
| Barrel length | 10.5 in. |
| Barrel profile | Medium |
| Barrel material | 4150 |
| Twist rate | 1:7 |
| Muzzle thread | 5/8x24 |
| Gas system | Pistol |
| Handguard | 10 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 |
| Country of origin | U.S.A. |
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.
When does it ship, and is there a warranty?
It ships in 2-3 business days. One Horse makes this upper and backs it with a limited lifetime warranty. See warranty details.
Dealers: Carry One Horse
American-made uppers, rifles and parts.
Get your 10.5″ .300 BLK upper
Made in the U.S.A. Ships in 2-3 business days.
Suppressors
Take Charge with Breek!
Most Popular Add-ons
10.5″ .300 BLK AR-15 Complete Upper
MSRP: Original price was: $379.99.$329.99Current price is: $329.99.
Description
Conquer close-quarters with this compact 10.5″ .300 Blackout Complete Upper Receiver. Featuring a 10.5″ barrel with a 1:7 twist rate, this upper ensures optimal stabilization for both subsonic and supersonic rounds, making it ideal for tactical, hunting, or suppressed AR15 pistol builds. The 10″ 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.
- 10.5″ .300 Blackout barrel with 1:7 twist for versatile bullet compatibility
- 10″ 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!
Only logged in customers who have purchased this product may leave a review.
Related products
-
AR15 Lower Parts KitSKU: OH-LPK01MSRP: Original price was: $54.99.$49.99Current price is: $49.99. -
10.5″ 5.56 AR-15 Carbine Barrel (1:7)SKU: OH-BR05MSRP: Original price was: $99.99.$89.99Current price is: $89.99. -
-
Reviews
There are no reviews yet.