Description
Picture this: you need a rifle that’s fast-handling in tight spaces—a vehicle, a home’s hallway, a treestand. You need the reach and authority of a 5.56mm NATO round, but a traditional rifle’s length is a liability. That’s the exact scenario where the Kel-Tec RDB Bullpup 5.56mm NATO/223, OD Green Grip, 20rd shines. It’s a compact, reliable, and uniquely American bullpup rifle that reconfigures the standard rifle layout for superior maneuverability without sacrificing barrel length or ballistic performance.
The Kel-Tec RDB Bullpup is a gas-operated, semi-automatic rifle chambered in 5.56x45mm NATO/.223 Remington. Its defining bullpup design places the action and magazine behind the trigger, resulting in a full 20-inch barrel in an overall package just 26.1 inches long. This configuration, paired with its ambidextrous controls and downward-ejecting spent casings, makes it a practical and adaptable tool for a variety of roles. It ships to Missouri and compliant US states, ready for your next range day or duty.
Key Features
Let’s talk about what makes this rifle work. The bullpup layout is the headline. By moving the magazine well into the stock, Kel-Tec achieves a drastic reduction in overall length. You get a 20-inch barrel’s velocity and accuracy potential in a package shorter than most 16-inch-barreled carbines. That means quicker transitions, easier storage, and less to get caught on doorframes or brush. The balance point shifts rearward, too, making the 7.3-pound rifle feel surprisingly agile in the hands.
Practicality is engineered into every control. The RDB features a fully ambidextrous safety and magazine release. Its true genius for left-handed shooters—or for avoiding hot brass in tight quarters—is the downward ejection system. Spent casings are driven straight down through a chute in the pistol grip, making the rifle completely agnostic to which shoulder you fire from. No gunsmithing required to switch sides; it just works. The adjustable gas system lets you tune the action for different ammunition types or suppressor use, a feature often reserved for higher-priced platforms.
The OD Green grip provides a secure, textured hold, and the rifle’s Picatinny rail atop the receiver is ready for your optics of choice. Speaking of compatibility, the RDB uses readily available and affordable standard AR-15 magazines, so your existing stash of PMAGs or USGI mags is ready to go. This keeps your logistics simple and your cost of ownership down.
| Caliber | 5.56x45mm NATO / .223 Remington |
| Barrel Length | 20 inches |
| Overall Length | 26.1 inches |
| Weight (unloaded) | 7.3 lbs |
| Magazine Capacity | 20 Rounds (Accepts standard AR-15 mags) |
| Finish/Frame | OD Green Grip, Black Anodized Aluminum |
Pros & Cons
Pros: The compact length for a full-power rifle is its greatest asset. The ambidextrous, downward-ejecting design is brilliantly executed and genuinely useful. It uses ubiquitous AR magazines. The adjustable gas block is a premium touch. At $1075.54, it offers unique capability in its price bracket.
Cons: Bullpup triggers are historically different—this one is a long, two-stage pull that some shooters need to adapt to. The manual of arms is different from an AR-15, requiring dedicated practice to build muscle memory. Field stripping is more involved than a direct-impingement AR.
Who It’s For
This rifle is for the practical shooter who values compactness and ballistic efficiency. It’s ideal for a home defender who needs a capable rifle that’s easy to maneuver indoors. It’s for the truck owner or recreational shooter who wants a serious rifle in a short package. It’s also a perfect fit for left-handed shooters tired of adapting to right-ejecting guns. If your needs prioritize a short overall footprint without giving up barrel length, this is your platform.
Frequently Asked Questions
Q: Is the Kel-Tec RDB reliable?
A: Yes. The RDB uses a proven short-stroke piston system and has a track record of solid reliability with quality ammunition. Its adjustable gas system allows you to fine-tune it for specific loads or when adding a suppressor, which enhances its reliability across different conditions.
Q: How difficult is it to clean compared to an AR-15?
A: It’s more involved. Field stripping the RDB requires removing several pins and components to access the bolt and gas piston. It’s not complicated, but it’s not the simple two-pin takedown of an AR. Plan on a few more minutes for cleaning—a fair trade for its compact design for many users.
Q: Can I mount a sling and accessories easily?
A: Absolutely. The rifle has multiple integrated sling attachment points. The full-length top Picatinny rail is ready for optics, and the handguard has M-LOK compatible slots at the 3, 6, and 9 o’clock positions, allowing you to mount lights, vertical grips, or other accessories using standard M-LOK hardware from brands like Magpul or Streamlight.
Ready to handle a different kind of rifle? The Kel-Tec RDB Bullpup offers a proven, compact solution for the 5.56mm shooter. See its full details and check availability at firearms-missouri.com for Missouri residents and nationwide. FFL transfer required for firearm purchases.
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