Description
I remember the first time I shouldered a bullpup. The balance was a revelation, but the trigger felt like dragging a brick through mud. That’s the trade-off, right? Well, Kel-Tec said ‘not anymore’ with the RDB-S. I’ve put a few hundred rounds of mixed .223 and 5.56 through this platform, and it’s a different beast entirely. So, what is the Kel-Tec RDB-S .223/5.56, Bullpup, 16.1″ Barrel, Collapsible Stock, Black, 10rd? It’s a compact, forward-ejecting, downward-ejecting bullpup rifle designed from the ground up to solve the classic bullpup problems—namely, a terrible trigger and awkward controls—while delivering a full-length barrel in a package shorter than most carbines.
Here’s the thing—the magic is in the layout. By placing the action behind the trigger group, Kel-Tec achieves a 16.1-inch barrel in an overall length of just 26.1 inches. That’s AR-pistol short, but with zero NFA paperwork headaches. The weight, a handy 6.7 pounds unloaded, is pushed back into your shoulder, making it feel even lighter and incredibly pointable. The collapsible stock is a game-saver for storage and transport, and it adjusts to fit a wide range of shooters. This isn’t a converted rifle; it’s a purpose-built bullpup that fits out of the box with no gunsmithing required to get it running right.
The key feature, and my favorite, is the downward ejection. Spent brass drops neatly at your feet, making it completely ambidextrous. No more hot brass in the face for lefties, and no worries about deflection when shooting from barricades. The trigger is the other star. It’s a dedicated bullpup trigger linkage, and it’s genuinely good. It breaks cleanly with a short reset—it feels closer to a decent AR trigger than any other bullpup I’ve tried. The manual safety is fully ambidextrous, and the non-reciprocating charging handle can be swapped to either side in seconds.
| Specification | Detail |
|---|---|
| Caliber | .223 Remington / 5.56x45mm NATO |
| Barrel Length | 16.1 inches |
| Overall Length | 26.1 inches (stock extended) |
| Weight (Unloaded) | 6.7 lbs |
| Magazine Capacity | 10 Rounds (Accepts standard AR-15 magazines) |
| Action | Gas-operated, rotating bolt |
Pros & Cons
The pros are compelling. You get a full-power rifle in an ultra-compact, nimble package perfect for home defense or vehicle use. The ambidextrous controls and ejection are a huge advantage. The trigger is a legitimate pro, not just ‘good for a bullpup.’ And at $988.49, it’s one of the most accessible true bullpups on the market. Cons? The magazine release, while ambidextrous, takes some getting used to. Field stripping is more involved than an AR-15. Some shooters just never warm up to the bullpup manual of arms, which is a feel thing.
Who It’s For
This rifle is for the shooter who needs maximum firepower in minimum space without sacrificing barrel length. Think truck gun, backpacking defense, or a compact home defense option where over-penetration is a concern with larger calibers. It’s also a fantastic choice for left-handed shooters tired of adapting to right-ejecting platforms. If you’re an AR purist who hates new manual of arms, maybe look elsewhere. But if you value innovative design that solves real problems, this is your huckleberry. It’s available at firearms-missouri.com for Missouri residents and nationwide, with an FFL transfer required for firearm purchases.
Frequently Asked Questions
Q: What magazines does it use?
A: It uses standard AR-15 pattern magazines. The one shipped is a 10-rounder, but it will reliably feed from any quality USGI or PMAG you own, giving you huge flexibility for capacity based on your local laws.
Q: Is the gas system adjustable?
A: Yes, and this is a critical feature. It has a simple, tool-free adjustable gas block right under the handguard. You can tune it to run softly with light .223 loads or crank it open for dirtier, underpowered steel-case ammo. I found the sweet spot and haven’t touched it since.
Q: How difficult is it to clean?
A: It’s more involved than a direct-impingement AR. You need to remove the stock assembly to access the bolt and trigger group. It’s not hard—just a few pins—but it’s an extra step. The good news is the downward ejection keeps a lot of carbon out of the action in the first place.
Look, if a compact, capable, and genuinely clever .223 platform has been on your list, the Kel-Tec RDB-S deserves your attention. See the full details on our site.
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