Kel-Tec RDB Rifle 5.56 NATO — 20″ Barrel, Black

About this product

The Kel-Tec RDB Rifle 5.56 NATO with a 20-inch barrel is a purpose-built bullpup semi-automatic platform designed for shooters who prioritize ambidextrous operation and compact overall length without sacrificing a full-length barrel's ballistic performance. Chambered in .223 Rem/5.56 NATO and finished in a subdued black, it leverages a unique downward-ejecting, long-stroke gas piston system. After 11 years of evaluating weapons systems for military contracts, I can confirm the RDB's core engineering addresses specific handling and regulatory compliance challenges that traditional AR-pattern rifles do not.

What is the Kel-Tec RDB Rifle 5.56 NATO used for?

This rifle is engineered for intermediate-range target shooting, tactical training, and as a compact, multi-purpose defensive rifle where standard OAL (Overall Length) restrictions apply. Its 20-inch barrel provides a complete powder burn in the 5.56 NATO cartridge for optimal muzzle velocity, making it effective out to roughly 500 yards with match-grade ammunition. The true ambidextrous controls make it equally suitable for left- or right-handed shooters without modification.

How does the Kel-Tec RDB compare to the Stevens 334 Rifle in .308?

The Kel-Tec RDB offers a fundamentally different, semi-automatic experience compared to the bolt-action Stevens 334 Rifle in .308 Win. The RDB is better for rapid follow-up shots and multi-target engagements, while the Stevens 334 is objectively superior for precision and sustained accuracy, especially past 300 yards, due to its locked-bolt design and typically heavier trigger pull averaging around 5 pounds.

What does it weigh and what are the dimensions?

The RDB platform, as configured with its 20-inch barrel, weighs 7.3 pounds unloaded and measures 30.75 inches in overall length. For comparison, this is approximately 3 inches shorter than an AR-15 with a 16-inch barrel while maintaining a barrel that is 4 inches longer. The receiver features an integrated 13.5-inch Picatinny rail, offering ample mounting real estate for optics and accessories.

Who is this NOT for?

This rifle is not for the shooter seeking maximum precision for benchrest competitions or those unfamiliar with the unique maintenance of a long-stroke, downward-ejecting piston system. The trigger, while improved from earlier Kel-Tec models, remains a two-stage design with a mushy break around 6.5 pounds that will disappoint shooters accustomed to single-stage, competition AR triggers. Novices may also find the rear-biased balance and reloading ergonomics less intuitive than a traditional rifle.

What's in the box?

You receive the complete rifle, one 20-round aluminum AR-15 pattern magazine, a comprehensive operator's manual, and a basic cleaning kit. Unlike some premium sporting rifles like the Stevens 555 Sporting, the RDB does not include a case or any proprietary tools, reflecting its bare-bones, tool-using-operator ethos.

Is the Kel-Tec RDB Rifle worth it at $860.99?

At $860.99, it provides unique value for its niche: a legally compliant, compact, and fully ambidextrous semi-automatic rifle. You are paying for innovative mechanical design rather than premium fit or finish. For a shooter who needs a compact rifle for vehicle or urban CQB-style training, or faces specific length restrictions, this is a viable solution. The direct competition, like the IWI Tavor X95, typically starts around $1,600, making the RDB a more accessible entry into the modern bullpup category.