Diamondback DB15 Combo 5.56/.300 BLK 16" FDE 2 Uppers M-LOK

The Diamondback DB1721K061 DB15 Combo delivers exceptional versatility with dual-caliber capability in a single platform. This configuration provides shooters with both 5.56x45mm NATO and .300 Blackout options, eliminating the need for separate rifle systems while maintaining consistent handling characteristics across both calibers.

What Makes This Different

The dual-upper configuration sets this DB15 apart from standard single-caliber rifles. Both uppers share the same FDE carbon fiber receiver and 12-inch M-LOK handguard system, ensuring consistent ergonomics and accessory placement regardless of caliber selection. The .300 Blackout upper excels in suppressed applications and close-quarters scenarios, while the 5.56 NATO upper provides extended range capabilities and ammunition availability.

Key Features

• Dual upper receivers: 5.56x45mm NATO and .300 Blackout with 16-inch barrels
• FDE carbon fiber receiver construction for reduced weight and enhanced durability
• 12-inch M-LOK handguard with full-length Picatinny top rail
• Magpul MOE carbine stock with multiple length-of-pull positions
• Magpul MOE grip for improved control and comfort
• 30-round magazine capacity compatible with standard STANAG magazines
• Carbine-length gas system for reliable cycling with various ammunition weights

Both calibers perform effectively across multiple applications. The 5.56 NATO configuration handles everything from precision shooting to tactical applications, while the .300 Blackout excels in hunting scenarios and suppressed operations. The M-LOK handguard accommodates lights, lasers, and bipods without additional rail sections. Weather-resistant finishes protect against corrosion in field conditions.

Technical Specs

• Calibers: 5.56x45mm NATO and .300 AAC Blackout
• Barrel Length: 16 inches (both uppers)
• Overall Length: 32.75-36.75 inches (depending on stock position)
• Weight: Approximately 6.5-7 pounds per complete rifle
• Receiver: FDE carbon fiber construction
• Handguard: 12-inch M-LOK with Picatinny top rail
• Stock: Magpul MOE carbine stock, black
• Grip: Magpul MOE pistol grip, black
• Magazine Capacity: 30+1 rounds
• Gas System: Carbine-length
• Twist Rate: 1:7 (5.56), 1:8 (.300 BLK)
• Thread Pitch: 1/2x28 TPI

This combo package eliminates the compromise between caliber selection and platform familiarity. Shooters maintain consistent training and muscle memory while accessing the ballistic advantages of both cartridges through simple upper receiver changes.