The Daniel Defense M4A1 is an AR-pattern semi-automatic rifle chambered in 5.56 NATO with a 14.5-inch barrel. It has a RIII rail system and an OD Green finish. The 14.5-inch barrel configuration is a short-barreled setup; transfer requires additional federal paperwork unless the muzzle device is permanently attached to bring the overall length to the legal minimum. 
 

Key Specifications 

• Brand: Daniel Defense 
• Model: M4A1 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Barrel Length: 14.5 inches 
• Color/Finish: OD Green 
   

Detailed Features 

• 14.5-inch barrel AR-pattern configuration 
• RIII rail system handguard 
• OD Green finish throughout 
• Sport Inc Exclusive variant (WEBGB-SI-SMU)

The Daniel Defense M4A1 is well regarded among owners who want a mil-spec-influenced AR-pattern build with tighter quality control than budget options. The RIII rail gets consistent praise for its slim profile and solid mounting surface without unnecessary bulk.

The OD Green finish is a point of personal preference. Some owners specifically seek it out for the aesthetic, while others find it harder to source matching accessories compared to black or FDE. Finish durability under regular use is generally reported as solid for a Cerakote-type application.

The 14.5-inch barrel configuration draws the most discussion, mainly around the paperwork and registration process for those configuring it as an SBR. Owners who have navigated that process tend to view the end result favorably, while some prospective buyers opt for the 16-inch version to avoid the additional steps.