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Bullpups solve a real problem: you keep full rifle velocity out of a 16.1 inch barrel while the whole gun measures just 26.1 inches. The KelTec RDB-S takes that idea and strips it down for the backcountry, weighing in at 5 pounds 14 ounces with a slim profile that slides into a pack, behind a truck seat, or onto an ATV rack without a fight. This version wears OD Green furniture with a black nitride barrel, and the adjustable stock gives you length of pull options most bullpups never offer.
The RDB name stands for Rifle, Downward-ejecting Bullpup, and that ejection system is the trick that makes this whole platform work. Spent brass drops straight down through the stock behind the magwell instead of flying past your face, so lefties can run it exactly like right-handed folks can. The magazine release is ambidextrous, the operating handle is reversible, and the cross bolt safety sits right where your thumb expects it. KelTec also put real effort into the trigger, which is a sore spot on most bullpups, and it shows with a smooth take-up and clean break.
The adjustable short-stroke gas piston is a genuinely useful feature, not a spec sheet gimmick. Open it up for dirty conditions or budget ammo, or dial it back to tame gas when running a can on the threaded muzzle. It accepts standard AR-15 pattern magazines and ships with a 20-rounder, so feeding it is never a scavenger hunt. Flip-up front and rear sights come installed, and the 1:7 twist barrel stabilizes heavier modern 5.56 loads just fine.
This is the smallest, lightest rifle in the RDB family, built for people who want centerfire rifle capability in something they can carry all day and stow anywhere. Between the neutral balance over the grip, mild felt recoil, and Picatinny rail up top for a red dot or low power optic, it makes a smart backpack rifle, camp gun, or compact home setup that punches well above its size.
Yes, and that is one of its best practical features. It runs standard AR-15 pattern magazines, so PMAGs, aluminum GI mags, and even drums will feed it. It ships with a 20-round magazine, and a flush-fit 10-rounder keeps the profile extra slim if you want it for packing.
It is one of the most lefty-friendly bullpups on the market. Spent brass ejects straight down behind the magwell instead of out the side, so nothing flies across your face when shooting off the left shoulder. The magazine release is mirrored on both sides and the operating handle can be swapped to either side.
Yes, the muzzle is threaded and the RDB-S makes a solid suppressor host. The adjustable gas piston is the key here, since you can turn the gas down to reduce backpressure and blowback when the can is mounted, then open it back up for unsuppressed use.
At 26.1 inches overall, it is roughly six to ten inches shorter than a typical 16 inch AR-15 with the stock collapsed, yet it keeps a full 16.1 inch barrel with no velocity penalty. At 5 pounds 14 ounces it is also lighter than most ARs, which is why it gets so much love as a truck, pack, and backcountry rifle.
| UPC | 640832007503 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RDBSGRN |
| Action | |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Finish | Black Nitride |
| Barrel Length | 16.1" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 20 |
| Color | B |
| Length | 36.9000 |
| Safety | Manual |
| Sights | Flip Up Front & Rear |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| Units per Box | 1 |
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