# Kel-Tec RDB Bullpup 5.56 NATO Semi-Auto Rifle - Black

**Brand:** Kel-Tec
**Category:** Bullpup Rifles
**Caliber:** 5.56 NATO

## Specifications

- **Caliber:** 5.56 NATO
- **Barrel Length:** 20.5"
- **Capacity:** 20 rounds
- **Finish:** Salt Bath Nitride
- **Weight:** 110.4 oz
- **Overall Length:** 30.4"
- **UPC:** 640832005974
- **SKU:** UCBHUnmyM

## Description

The Kel-Tec RDB is a bullpup semi-automatic rifle chambered in 5.56x45mm NATO / .223 Remington with a 20.5-inch barrel in a 30.4-inch overall package.

### Key Specifications
- **Caliber**: 5.56x45mm NATO / .223 Remington
- **Action**: Semi-Automatic
- **Barrel Length**: 20.5 inches
- **Overall Length**: 30.4 inches
- **Weight**: 6.9 lbs.
- **Capacity**: 20 rounds (1 magazine included)
- **Finish**: Black

### Detailed Features
The bullpup layout puts the action behind the pistol grip, which is how a 20.5-inch barrel fits in a 30.4-inch overall length. Brass ejects downward rather than to the side, which eliminates the typical lefty-shooter problem with AR-pattern rifles and keeps ejected cases out of other people's space. Controls are fully ambidextrous. The receiver is 4140 steel; the stock and grip are Zytel polymer. Picatinny rails at front and rear positions accept optics and accessories. There are no built-in sights.

### Usage
The RDB trades the familiar AR layout for a more compact form factor without giving up barrel length. The downward ejection system makes it genuinely ambidextrous. It is a useful option for home defense or range work where a shorter overall footprint matters.

## Frequently Asked Questions

**Q: What caliber is the RDB?**

A: The RDB is chambered in 5.56x45mm NATO / .223 Remington.

**Q: Who makes the RDB?**

A: Kel-Tec makes the RDB.

**Q: What type of firearm is the RDB?**

A: It is a bullpup semi-automatic rifle. The action sits behind the pistol grip, which lets a 20.5-inch barrel fit in a 30.4-inch overall length.

**Q: What is the barrel length of the RDB?**

A: The barrel is 20.5 inches long.

**Q: How many rounds does the RDB hold?**

A: It has a 20-round capacity and ships with one magazine.

**Q: Where can I buy the RDB?**

A: Compare current vendor offers on this page.

## What Reviewers Say

*Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.*

> Hand guard heated up like crazy i have never felt the gun this hot before.
>
> — [Honest Outlaw](https://www.youtube.com/watch?v=sFf-xOOcty4&t=689s)

> The recoim pulse was extreme i'm not really sure why that is but by comparison to something like the geisley super duty 10 and a half inch this has triple the recoil.
>
> — [Honest Outlaw](https://www.youtube.com/watch?v=sFf-xOOcty4&t=704s)

> Springfield hellion is significantly superior to this gun in my personal opinion and springfield is a company i like less than i like kel-tec.
>
> — [Honest Outlaw](https://www.youtube.com/watch?v=sFf-xOOcty4&t=745s)

> Recoiling pulse as far as uh ergonomics as far as overall accuracy and ease of use this gets a solid f from me.
>
> — [Honest Outlaw](https://www.youtube.com/watch?v=sFf-xOOcty4&t=809s)

## What Customers Say

*AI-generated insights from customer reviews*

The bullpup layout and resulting compact size are the most-discussed positives. Owners who prioritize maneuverability in tight spaces find it genuinely useful. The downward ejection system draws consistent praise from left-handed shooters and in shared-lane range settings.

Lightweight construction and acceptable accuracy at range are other positives. Affordability compared to other semi-autos in the class is mentioned favorably.

On the downside, reliability concerns appear more often than with more established platforms. Some owners report feeding or cycling issues under certain conditions or with specific ammunition. Trigger quality is the second most common criticism, with many finding the pull heavy or rough compared to AR-15 alternatives. Aftermarket support is limited compared to the AR-15 ecosystem, which frustrates owners who want to customize. Ergonomics are not universally liked. Control placement and stock feel vary between users.

## Pricing

**13 offers available**

| Vendor | Price |
|--------|-------|
| Grabagun Com | $779.99 |
| Gritrsports Com | $796.99 |
| Shootingsurplus Com | $797.23 |
| Impactguns Com | $805.39 |
| Kygunco Com | $807.95 |
| Buds Gun Shop | $810.99 |
| Centerfiresystems Com | $834.99 |
| Guns Com | $848.99 |
| Globalordnance Com | $849.30 |
| Primaryarms Com | $849.99 |

*...and 3 more offers*

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- [Kel-Tec RDB Black: 5.56 NATO Bullpup, Downward Eject, Semi-Auto](https://gunsnation.com/p/kel-tec-rdb-black-5-56-nato-bullpup-downward-eject-semi-auto/UCBHUnmxr)
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*Data from [GunsNation](https://gunsnation.com)*