KelTec RDB Defender 5.56 NATO / .223 Rem

The KelTec RDB Defender is a bullpup-style semi-automatic carbine chambered for .223 Rem / 5.56 NATO that is intended for compact, short-configuration shooting applications such as range use, training, and sport shooting. The design emphasizes ambidextrous operation and compact handling while retaining full-length ballistic performance from a carbine-length barrel.

The RDB Defender pairs a polymer receiver and collapsible polymer stock with a pencil-profile steel barrel and an aluminum M-LOK handguard to provide a lightweight, balanced platform. Its downward-ejection system routes spent cases through the stock behind the magazine well for truly ambidextrous operation, and the rifle uses an adjustable gas piston system to support a range of loads and accessories.

Key Specifications

• The caliber is .223 Rem / 5.56 NATO.
• The barrel length is 16.1 inches.
• The action is Semi-automatic.
• The model designation is RDB Defender.
• The rate of twist is 1:7.
• The barrel material is steel.
• The stock material is polymer and the stock is described as collapsible.
• The forend is an aluminum M-LOK handguard.
• The safety is ambidextrous.
• The rifle is configured for right-hand operation in the supplied configuration while employing downward ejection for ambidextrous usability.

The KelTec RDB Defender combines a compact bullpup layout with .223 Rem / 5.56 NATO performance and ambidextrous controls. Consider the KelTec RDB Defender 5.56 NATO / .223 Rem when a short overall package with full ballistic capability is required.