High-quality black rifle upper receiver with a sleek design, featuring a lightweight handguard and precision craftsmanship.

Black AR-15 upper receiver with M-LOK handguard, showcasing precision craftsmanship and reliability for firearm enthusiasts.

Black AR-15 upper receiver with M-LOK handguard, showcasing durable construction and precision engineering for reliability.

Black AR-15 upper receiver with a lightweight handguard, showcasing precision craftsmanship and reliability for enthusiasts.

Details

Upgrade your rifle with this dependable 16″ .300 BLK complete upper receiver. Built for accuracy and smooth performance, it features a free-float 15″ M-Lok handguard for solid accessory mounting and improved barrel stability. The nitride BCG delivers reliable cycling and low-maintenance durability, while the full-length Picatinny rail gives you plenty of room for optics. Ready to pin onto any Mil-Spec lower, this upper is built in the U.S.A. and ready for work.

Includes: 16″ .300 BLK barrel (1:7 twist), 15″ M-Lok free-float handguard, nitride BCG, charging handle, clamp-on system with steel barrel nut and screws.

Reliable, modular, and ready to run.

Every One Horse rifle and component is made in America with uncompromising standards. We use U.S.-sourced materials, U.S. manufacturing, and strict quality control at every step. No shortcuts, no imported surprises — just dependable parts built by people who take pride in American craftsmanship. When you run One Horse, you’re running gear you can trust every single day.

16″ .300 BLK Complete Upper Receiver – 15″ M-Lok Free-Float Handguard, Nitride BCG & Charging Handle

SKU: OH-CU04 Categories: Complete Uppers, Parts

MSRP: Original price was: $399.99.Current price is: $349.99.

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SPECIFICATIONS

Caliber: .300 BLK

Barrel Profile: SOCOM

Muzzle Thread: 5/8X24

Twist Rate: 1/7

Gas System: Pistol

Muzzle Device: A2

Material: 4150

Handguard Length: 15 in.

Manufacturer: One Horse

Country of Origin: U.S.A.

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