The Kel-Tec RDB Carbine is a bullpup semi-automatic rifle chambered in 5.56 NATO / .223 Remington. Its bullpup layout puts the action behind the trigger group, resulting in a 27.4-inch overall length while retaining a 17-inch barrel. Weight is 7 lbs; capacity is 30 rounds. Finish is tan. The receiver is 4140 steel; stock components are Zytel. Part number RDBTAN. 
 

Key Specifications 

• Model: Kel-Tec RDB 
• Caliber: 5.56 NATO / .223 Remington 
• Barrel Length: 17 inches 
• Capacity: 30 rounds 
• Weight: 7 lbs (112 oz) 
• Total Length: 27.4 inches 
• Finish Color: Tan 
• Manufacturer Part Number: RDBTAN 
   

Detailed Features 

The bullpup configuration keeps the package compact without cutting barrel length. The fully adjustable piston system lets users tune the operating system to different ammunition types and conditions. Front and rear Picatinny rails are standard for optics and accessories. The lever safety is straightforward. The downward-ejection system ejects brass below the action, avoiding brass-in-face issues for left-handed shooters and reducing ejection unpredictability at the range. 
 

Target Audience 

Shooters who want a compact rifle without sacrificing barrel length -- particularly those in confined spaces or who value packability. Left-handed shooters benefit directly from the downward-ejection design. 
 

Usage Scenarios 

The compact overall length makes it practical for home defense where maneuverability in tight spaces matters. On the range, the 30-round capacity works well for most drills. Competition shooters using bullpup-legal matches will find the RDB's ergonomics suited to that format.

The Kel-Tec RDB draws positive attention for its compact bullpup design and the downward-ejection system. The short overall length is consistently praised, as is the lighter weight compared to standard-configuration 5.56 rifles of similar barrel length. Ambidextrous usability and the downward ejection are recurring favorites.

Reliability with certain ammunition types comes up as an area to watch; some users report occasional issues depending on load and conditions. The trigger, a common bullpup compromise, receives mixed reviews -- it functions, but some shooters find the feel less crisp than a traditional AR trigger. Aftermarket support is more limited than for AR-platform rifles, which matters to owners who like customizing heavily.

The tan color is a matter of personal taste. Control ergonomics are occasionally noted as different from traditional rifle layouts, which takes some adaptation. At its price point, most owners consider the RDB a solid value for a compact bullpup, though the reliability concerns are worth accounting for before depending on it in a critical-use role.