One Horse AR15 Complete Upper, 16-inch, .300 Blackout

The One Horse AR15 Complete Upper (brand part no. OH-CU04) is a complete AR-15 upper chambered in .300 Blackout with a 16-inch barrel and a 1-in-7 twist rate. At 16 inches, it clears the federal minimum rifle barrel length, and it’s ready to attach to a compatible lower to complete a rifle build.

Key Specifications

• Sold as a complete upper, ready to attach to a compatible lower.
• Barrel measures 16 inches, clearing the federal minimum rifle barrel length.
• Chambered in .300 Blackout.
• Uses a 1-in-7 twist rate, stabilizing both supersonic and heavier subsonic loads.
• Includes the bolt carrier group and charging handle as part of the complete assembly.
• Legal to build as a rifle with no special paperwork at this barrel length.
• Fits standard mil-spec AR-15 lower receivers.
• Cataloged by One Horse under its OH-CU complete-upper model line.
• Manufactured by One Horse.

Frequently Asked Questions

Is this barrel legal without any special paperwork? Yes, at 16 inches it clears the federal minimum rifle barrel length, so no NFA registration is required.

Will this stabilize subsonic .300 BLK ammo? Yes, the 1-in-7 twist rate is fast enough to stabilize the heavier subsonic bullet weights common in .300 Blackout as well as lighter supersonic loads.

Does this include a lower receiver? No, this is a complete upper only; the lower receiver is sold separately.

Buy the One Horse Complete Upper, 16in, .300 Blackout

Order the One Horse AR15 Complete Upper through our One Horse lineup at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop, along with more AR15 uppers.