KelTec RDB Defender 5.56 NATO 16.1″ Green

The KelTec RDB Defender is a compact, ambidextrous bullpup rifle chambered for .223 Rem / 5.56 NATO with a 16.1-inch pencil-profile barrel. It pairs a short overall package with an aluminum M-LOK handguard and OD green synthetic furniture. The platform is designed for users who want a compact carbine footprint with fully ambidextrous controls and a downward-ejection system.

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 rifle uses an aluminum M-LOK handguard for accessory mounting.
• The platform features a downward ejection bullpup system for true ambidextrous operation.
• The stock is a collapsible OD Green synthetic design.
• The metal components have a blued / black finish.
• The twist rate is 1:7.
• The design accepts detachable, standard AR-15 magazines.

With a short, balanced bullpup layout and ambidextrous controls, the RDB Defender is suited to compact carbine roles such as range use, transportable utility, and close-quarters applications where a shorter overall package is desirable. The combination of a pencil-profile barrel, adjustable gas piston system (as implemented across the RDB family), and M-LOK handguard provides a flexible baseline for practical use without unnecessary complexity.