The KelTec RDB is a bullpup semi-automatic rifle chambered in 5.56x45mm NATO / .223 Remington. Placing the action behind the trigger group keeps overall length to 27.3" while preserving a 17.3" barrel — short enough for tight spaces, long enough to extract reasonable velocity from 5.56mm. At 7 lbs it is not ultralight, but the balance is better than a conventional layout of similar barrel length. 
 

Key Specifications 

• Brand: KelTec 
• Model Name: RDB 
• Caliber: 5.56x45mm NATO / .223 Remington 
• Barrel Length: 17.3 inches 
• Capacity: 20+1 rounds 
• Weight: 7 lbs (112 oz) 
• Length: 27.3 inches 
• Action Type: Semi-Automatic 
• Trigger Type: Standard trigger 
• Grip Type: Standard grip with synthetic green finish 
• Stock Type: Fixed Bullpup stock (Zytel) 
• Sights: Optic ready with Picatinny rail 
   

Detailed Features 

The bullpup layout shifts the action rearward, which concentrates mass closer to the shooter's body and helps with muzzle control. The Picatinny rail runs the full top of the receiver, so optics mount without adapters. Barrel finish is salt bath nitride. The fixed Zytel stock keeps the profile slim and rigid. 
 
The downside common to bullpups applies here: the trigger linkage is longer than on a conventional rifle, and the standard trigger reflects that. Most users add a trigger upgrade as a first modification. 
 

Usage Scenarios 

• Home Defense: The 27.3" overall length is easier to move through a home than a 36" carbine, and 20+1 of 5.56mm is capable. 
• Sport Shooting: Accurate and manageable recoil; Picatinny rail makes optic mounting straightforward. 
• Tactical Training: Compact profile and ambidextrous-friendly controls suit close-quarters drills.

The RDB draws a consistent split in owner feedback. On the positive side: the bullpup layout and 27.3" overall length genuinely make it easier to handle indoors or in vehicles, and most owners report good accuracy and manageable recoil during extended range sessions. The Picatinny rail and optic-ready setup are practical plusses.

The criticism is also consistent. Occasional feeding issues come up, often linked to specific ammunition brands; owners who tested multiple loads usually found combinations that run reliably. The trigger is a common complaint — the bullpup linkage produces a heavier, less crisp pull than most conventional AR triggers, and many owners budget for an aftermarket trigger as part of the purchase. KelTec customer service gets mixed marks: some report quick, helpful resolution; others describe difficulty getting support.

Price-to-feature comparisons vary depending on what the buyer is comparing it to. Against other bullpups at similar prices the RDB generally fares well; compared to conventional ARs it is a different value proposition. Transitioning from a standard rifle layout takes a short adjustment period, but most owners report adapting within a few range sessions.