The Kel‑Tec RDB Defender is a compact bullpup semi‑automatic rifle chambered for .223 Rem / 5.56 NATO. Its patented downward‑ejection system and ambidextrous controls make it suitable for both right‑ and left‑handed shooters. The 16.1″ pencil‑profile barrel paired with a 1:7 twist supports accurate performance with common 5.56/.223 loads. An aluminum M‑LOK handguard, collapsible polymer stock and a refined trigger system keep the platform lightweight and accessory‑ready.
Key Specifications
- The caliber is .223 Rem / 5.56 NATO.
- The barrel measures 16.1 inches and features a pencil profile.
- The action is semi‑automatic.
- The rifle uses a downward ejection system for truly ambidextrous operation.
- The handguard is an aluminum M‑LOK design for accessory mounting.
- The safety is ambidextrous for left and right users.
- The rate of twist is 1:7.
- The stock material is polymer (collapsible).
- The finish is OD Green with black metal accents.
- The rifle accepts standard AR‑15 detachable magazines.
Engineered as a compact, modern bullpup, the RDB Defender delivers ambidextrous ergonomics, a user‑friendly feature set and contemporary accessory compatibility. Its combination of a pencil‑profile barrel, adjustable gas system and M‑LOK handguard makes it suitable for range work, compact storage, and field use where a smaller footprint and full‑length ballistic performance are both priorities.





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