The Radical Firearms RF01861 is an AR-pattern semi-automatic rifle chambered in 6.5 Grendel with an 18-inch barrel and an RPR rail handguard. It has a magazine capacity of 15+1 rounds. The 18-inch barrel is a common choice for the 6.5 Grendel cartridge, giving the round more of its ballistic potential compared to shorter configurations. 
 

Key Specifications 

• Brand: Radical Firearms 
• Model: RF01861 
• Caliber: 6.5 Grendel 
• Action: Semi Auto 
• Barrel Length: 18 in 
• Capacity: 15+1 
   

Detailed Features 

• AR-pattern semi-automatic platform in 6.5 Grendel 
• 18-inch barrel 
• RPR rail handguard 
• 15+1 round capacity

Owners of Radical Firearms rifles in 6.5 Grendel tend to focus on the value-per-dollar argument. The RF01861 is generally seen as a capable production AR in a less common caliber without a premium price tag, which attracts builders who want a complete gun rather than a parts kit.

The 18-inch barrel length gets positive mentions from owners who prioritize longer-range capability with the 6.5 Grendel cartridge. A few owners note that the RPR rail provides a solid handguard platform, though some swap it for a different rail system to suit personal preference.

Quality control is the split point in owner feedback. Most report no issues out of the box, while a smaller group mentions needing to inspect or adjust components before trusting the rifle at the range. Trigger feel is a common upgrade target.