Kel-Tec RDB .223/5.56 20″ Barrel OD Green Grip 20rd

About this product

The Kel-Tec RDB (Rifle Downward-ejecting Bullpup) is a compact modern sporting rifle that places the action behind the trigger group to reduce overall length without sacrificing barrel length. This RDB is chambered for .223 Rem / 5.56 NATO and is built around a downward ejection system that enables true ambidextrous use. The rifle features a 20″ pencil-profile barrel and an OD green synthetic grip/stock, with a Mil-Spec Picatinny rail for optics and accessories. Intended as a practical, compact platform, the RDB is suited for range use and general field applications where a shorter overall footprint is desired.

Key Specifications

• Chambered for .223 Rem / 5.56 NATO for compatibility with common .223/5.56 ammunition.
• The barrel length is 20 inches in a pencil profile.
• The magazine capacity is 20 rounds and it accepts standard AR-15 compatible magazines.
• The action type is Semi-Auto for repeatable, manual-triggered operation.
• The rate of twist is 1:7″ to support a broad range of bullet weights.
• The design uses downward ejection to provide fully ambidextrous operation.
• The stock and grip are OD green synthetic for a durable, weather-resistant finish.
• Includes a 1913 Mil-Spec Picatinny rail for optics and accessory mounting.
• Equipped with an adjustable gas system (fully adjustable piston listed in manufacturer features).
• The muzzle is 1/2×28 threaded, allowing use of standard 1/2×28 muzzle devices.

The Kel-Tec RDB presents a distinct approach to a compact modern sporting rifle: long barrel performance in a shorter overall package with true ambidextrous ergonomics and AR-15 magazine compatibility. Its downward-ejection architecture, adjustable gas system, and Picatinny rail make it a practical option for shooters seeking a compact, adaptable platform that retains familiar AR-style magazines and feeding. For those prioritizing compact handling without giving up barrel length or ambidextrous function, the RDB is a straightforward, technically interesting choice.