The Daniel Defense DDM4 ISR is an AR-pattern rifle chambered in .300 AAC Blackout with a 9-inch barrel and an integral suppressor. The suppressor is built into the overall assembly, bringing the full muzzle-to-receiver length to 16 inches; transfer requires additional federal paperwork as an NFA-regulated item. The rifle has a 30+1 capacity and ships in black. 
 

Key Specifications 

• Brand: Daniel Defense 
• Model: DDM4 ISR 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Barrel Length: 9 in 
• Capacity: 30+1 
• Color: Black 
   

Detailed Features 

• Integral suppressor assembly; full assembly measures 16 inches 
• 9-inch host barrel under the integral suppressor 
• .300 AAC Blackout chambering 
• 30+1 round capacity 
• Black finish throughout

Owners of the DDM4 ISR point to the integral suppressor as the defining feature: it eliminates the snag-prone thread cap and keeps the overall package more balanced than a rifle with a can threaded on after the fact. The host barrel length and tight integration get consistent praise from those who want a compact, hearing-safe setup without swapping accessories.

Ergonomics split opinion more than the suppressor does. Some owners find the fixed suppressor adds forward weight they did not expect, and a few note that cleaning the integral unit is more involved than cleaning a removable can. On the flip side, those same owners tend to say the DDM4 ISR cycles subsonic .300 AAC Blackout reliably without adjustment.

The NFA transfer wait and premium price are the recurring complaints. Buyers who have already paid the tax and waited through the transfer process generally feel the DDM4 ISR delivers on its promise; those shopping on budget tend to look elsewhere. Aftermarket support for the DDM4 platform is wide, which makes this a practical long-term platform for those committed to the integral suppressor configuration.