The Kel-Tec RDB Defender is a compact, downward-ejecting bullpup rifle chambered for .223 Rem / 5.56 NATO built for users who need a shorter overall package without sacrificing barrel length. It is positioned for tactical, duty, and range applications where a compact footprint and ambidextrous operation are priorities. The Defender variant ships with an aluminum M-LOK handguard and a collapsible polymer stock for modular accessory mounting and storage.

Key Specifications

• The rifle is chambered in .223 Rem / 5.56 NATO as listed in manufacturer data.
• The action is semi-automatic and uses a detachable magazine.
• The barrel measures 16.1 inches and is described as a pencil profile in some listings.
• Standard magazine capacity is listed as 20 rounds and the platform uses standard AR-15 pattern magazines.
• The stock and major external components are finished in black synthetic polymer.
• The forend is an aluminum M-LOK handguard for accessory mounting.
• Features a downward ejection system to support true ambidextrous operation.
• The rifle operates with an adjustable gas piston system to tune carrier speed for suppressor use and varied ammunition loads.
• Published weight varies between sources; customers should verify the weight for their preferred listing prior to purchase.
• Overall length is listed inconsistently across sources; confirm whether the overall length is 26.1 inches or 27 inches when exact dimensions are required.

State and shipping notes: this model ships with a 20-round magazine and may be restricted by state magazine-capacity laws. States that commonly restrict magazines to 10 rounds include Hawaii, California, Connecticut, District of Columbia, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, and Colorado. The supplied product data also lists specific restrictions: no direct ship to California, Rhode Island, and Washington, and no sale to Illinois and Oregon. Buyers should confirm local laws and any dealer-specific restrictions before purchasing.

The RDB Defender emphasizes compact handling, ambidextrous controls, and a tuneable gas system while retaining a 16.1″ barrel for ballistic performance in a reduced overall package. Its M-LOK handguard and synthetic stock keep weight and modularity in focus for users who value a compact tactical platform.