The Kel-Tec RDB Defender is a compact bullpup rifle that places the action rearward for a shortened overall length while retaining a full-length barrel. It features a patented downward-ejection system that enables true ambidextrous use and an adjustable gas piston for tuning with various loads and suppressors. The Defender configuration pairs a lightweight construction with a tan polymer stock and M-LOK handguard for modular accessory attachment.
Key Specifications
- The caliber is .223 Rem / 5.56 NATO.
- The barrel measures 16.1 inches with a pencil profile.
- The action is Semi-Auto.
- The unloaded weight is 6.7 lbs.
- The overall length is 27 inches.
- The barrel twist rate is 1:7.
- The trigger pull is listed as 4.5–5.5 lbs.
- The finish color is Tan.
- The barrel material is Steel.
- The safety is Ambidextrous.
The RDB Defender is designed for users seeking a shorter overall package without sacrificing barrel length or controllability. Its downward-ejection system, adjustable gas piston and balanced ergonomics make it well suited to compact-duty roles, target work, or situations where maneuverability matters. The combination of ambidextrous controls and a lightweight build presents a practical option for shooters who value a compact, configurable modern sporting rifle platform.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.




