Diamondback DB15 5.56/300BLK

The Diamondback DB15 is an AR-style pistol offered with both 5.56 NATO and 300 AAC Blackout capability, designed for versatile use on the range and in precision short-barrel applications. Its dual-barrel configuration provides flexibility for shooters who require both 5.56 and 300 BLK performance in a single platform.

Built with practical ergonomics and modular features, this DB15 variant pairs a heavy, threaded 7″ 5.56 barrel with an additional threaded 10″ 300 AAC Blackout barrel. The platform incorporates an M-LOK handguard and Picatinny rail for accessory mounting, and it ships with an SB Tactical SBA3 stabilizing brace and a Magpul MOE K2 pistol grip for a stable, familiar interface.

Key Specifications

• The calibers are 5.56 NATO and 300 AAC Blackout.
• The 5.56 barrel length is 7 inches and the 300 AAC Blackout barrel length is 10 inches.
• The 5.56 barrel material is Chrome Moly Vanadium.
• The 5.56 barrel thread pattern is 1/2″x28 and the 300 BLK barrel thread pattern is 5/8″x24.
• The muzzle device on both barrels is an A2 flash hider.
• The magazine capacity is 30 rounds, supplied as a Magpul Gen3 PMAG MCT.
• The handguard is M-LOK compatible for accessory mounting.
• The upper features a Picatinny rail for optics and attachments.
• The stabilizing brace is an SB Tactical SBA3.
• The pistol grip is a Magpul MOE K2.

Buy the Diamondback DB15 5.56/300BLK online today for a versatile AR-style pistol platform that balances short-barrel handling with modular accessory options.