The One Horse OH-15 is a semi-automatic AR-15 pattern carbine chambered in 5.56 NATO with a 16-inch barrel and a 30-round capacity. It ships with an M-LOK handguard, a One Horse M4 6-position stock, and an A2 grip. 
 

Key Specifications 

• Brand: One Horse 
• Model: OH-15 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 30 rd 
• Barrel Length: 16 in 
• Color/Finish: Black 
   

Detailed Features 

• AR-15 pattern carbine in 5.56 NATO 
• 16-inch barrel 
• M-LOK handguard for accessory attachment 
• One Horse M4 6-position adjustable stock 
• A2 pistol grip 
• 30-round magazine included

Owners who pick up the OH-15 are typically looking for a functional AR-15 carbine at a competitive price. The M-LOK handguard and 6-position stock check the boxes most buyers expect from a modern carbine, and first impressions on fit and finish are generally positive for the price tier.

The One Horse name is less established than the major AR manufacturers, and some owners note that parts sourcing and warranty support can feel uncertain compared to brands with longer track records. Trigger feel tends to draw the most criticism, with many owners planning an upgrade after the first range session.

Value is the recurring theme in owner feedback on the OH-15. Buyers who want a ready-to-run 5.56 carbine without spending more find it gets the job done, while those who intended to use it as a competition or precision base say they would have spent more on the lower to start.