KelTec RDB Rifle .223 Rem/5.56mm 20rd Magazine

The KelTec RDB is a downward-ejecting bullpup rifle chambered for .223 Rem / 5.56mm and configured to use a 20‑round / AR-15 pattern magazine. Its RDB architecture routes spent cases downward rather than to the side, providing a truly ambidextrous layout. The rifle incorporates a short-stroke gas piston that is adjustable for various ammunition and muzzle attachments.

Key Specifications

• The caliber is .223 Rem / 5.56mm.
• The action is semi-automatic.
• Magazine capacity is 20 rounds and is compatible with AR-15 magazines.
• The rifle uses a downward ejection system as part of the RDB design.
• The controls and ejection are ambidextrous.
• The forend material is Zytel and includes a bottom Picatinny-style rail for accessories.
• The operating system is a short-stroke gas piston that is adjustable for different ammunition and muzzle attachments.
• The bolt is a rotary bolt with a spring-loaded ejector and an extractor oriented downward.
• The hammer is U-shaped and runs outside the ejection chute above the magazine.
• The design emphasizes compact bullpup ergonomics for shorter overall length in a rifle platform.

With its ambidextrous controls, adjustable gas system, and the RDB downward-ejection architecture, the KelTec RDB delivers a compact, practical platform for shooters seeking manageable handling and real-world adaptability in .223/5.56mm. The integrated rail and durable Zytel forend support a range of accessory setups while preserving the ergonomic benefits of a bullpup layout.