The Kel-Tec RDB is a compact, ambidextrous bullpup semi-automatic rifle chambered for .223 Rem/5.56 NATO and configured for modern sporting and range use. Its design reduces overall length while maintaining a comfortable balance and center of gravity over the grip. The rifle’s notable features include a downward-ejecting system and an adjustable gas piston that support a range of loads and suppressor use.

Key Specifications

• The caliber is .223 Rem / 5.56 NATO.
• The action is semi-automatic.
• The rifle accepts standard AR-15 style magazines and ships with a 20-round magazine.
• The design uses a downward ejection bullpup system to provide fully ambidextrous operation.
• It employs an adjustable gas piston system to tune bolt carrier speed for different loads and suppressor use.
• The barrel twist rate is 1:7″.
• The stock is a black synthetic polymer construction with an integrated grip and handguard mounting options.

State sale and shipping restrictions apply to this model: the product listing shows no direct shipments to California, Rhode Island, or Washington, and indicates no sale to Illinois (PICA) and no sale to Oregon. Buyers should confirm local availability before purchasing.

Be aware that several U.S. jurisdictions limit magazine capacity to ten rounds; those jurisdictions include: Hawaii, California, Connecticut, Washington D.C., Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, and Colorado. Confirm compliance with your state and local laws before acquiring or transferring magazines or magazines of this capacity.

The RDB’s compact bullpup layout, adjustable gas system, and AR-magazine compatibility make it a practical choice for shooters who value a shorter overall package without sacrificing familiar magazine logistics. Its downward-ejection architecture and synthetic stock emphasize ambidextrous usability and durability for range and general-purpose sporting applications.