# Kel-Tec RDB Defender 5.56 NATO Bullpup Rifle - Tactical Black

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

## Specifications

- **Caliber:** 5.56 NATO
- **Barrel Length:** 16"
- **Capacity:** 20 rounds
- **Finish:** Black 
- **Weight:** 94.4 oz
- **Overall Length:** 26.1"
- **UPC:** 640832008081
- **SKU:** UCBHUnnWL

## Description

The Kel-Tec RDB Defender is a semi-automatic bullpup rifle chambered in 5.56x45mm NATO / .223 Remington. The bullpup layout puts the action behind the trigger, shrinking the overall length to 27 inches while keeping a full 16.1-inch barrel. At 6.7 lbs. it's a manageable rifle for most shooters.

### Key Specifications
- **Caliber:** 5.56x45mm NATO / .223 Remington
- **Action:** Semi-Automatic
- **Capacity:** 20 rounds (plus 1 in the chamber)
- **Barrel Length:** 16.1 inches
- **Weight:** 6.7 lbs.
- **Finish:** Black
- **Overall Length:** 27 inches
- **Twist Rate:** 1:7 RH

### Detailed Features

The RDB Defender takes AR-pattern magazines, which keeps logistics simple if you already run that platform. An integrated Picatinny rail on top accepts standard optics. The downward-ejection system is the defining mechanical feature of the RDB line: spent cases eject below the rifle rather than to the side, which makes the gun genuinely ambidextrous and eliminates the brass-in-the-face problem that affects some other bullpup designs.

The 1:7 twist rate stabilizes heavier projectiles well, so 62 gr. and 77 gr. loads are appropriate choices. The collapsible stock gives some length-of-pull adjustment, which helps shooters of different builds get a consistent cheekweld on the raised comb.

### Usage Notes

The compact dimensions make it practical for home defense and vehicle storage. Sport shooters who want something different from the standard AR layout will find the balance and handling feel noticeably different. The main adjustment for new bullpup shooters is trigger reach and the longer trigger linkage feel, which takes range time to get comfortable with.

## Frequently Asked Questions

**Q: What caliber is the Kel-Tec RDB Defender?**

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

**Q: Who makes the RDB Defender?**

A: It is made by Kel-Tec.

**Q: What type of firearm is the Kel-Tec RDB?**

A: It is a semi-automatic bullpup rifle with a polymer receiver and collapsible stock.

**Q: What is the barrel length of the Kel-Tec RDB Defender?**

A: It has a 16.1-inch barrel.

**Q: How many rounds does the Kel-Tec RDB Defender hold?**

A: It has a 20+1 capacity and accepts AR-pattern magazines.

**Q: Is the Kel-Tec RDB Defender optic-ready?**

A: Yes. It has an integrated Picatinny rail on top that accepts standard optics.

**Q: Where can I buy the Kel-Tec RDB Defender?**

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 RDB Defender generates genuine enthusiasm among bullpup fans, tempered by honest assessments of its quirks.

Frequently discussed points:

1. The bullpup configuration is the main selling point for most buyers. The compact overall length without sacrificing barrel length is consistently praised for home defense and range use in tight spaces.
2. The lightweight build gets positive mentions from people who carry the rifle during extended sessions.
3. The ambidextrous controls and downward ejection are appreciated, particularly by left-handed shooters who struggle with other designs.
4. Reliability reports are mixed. Many owners run it without issues across various ammunition types. Others have had feeding problems or higher round-count malfunctions, and these tend to dominate forum discussions disproportionately relative to their frequency.
5. Accuracy at typical engagement distances is generally rated as good, though some users note that optimizing accuracy with a bullpup requires adjusting to the different sight radius and trigger feel.
6. Aftermarket support is more limited than for AR-15 platforms, which matters to owners who want to modify extensively.
7. Price sits in the mid-range of the bullpup category, and most see it as reasonable given the features.

## Pricing

**14 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $609.99 |
| Grabagun Com | $788.99 |
| Gritrsports Com | $799.99 |
| Shootingsurplus Com | $824.13 |
| Kygunco Com | $835.22 |
| Buds Gun Shop | $836.99 |
| Classicfirearms Com | $839.99 |
| Guns Com | $846.99 |
| Centerfiresystems Com | $847.99 |
| RK Guns | $849.99 |

*...and 4 more offers*

## Reviews

**Average Rating:** 5.0/5 (1 reviews)

> **jenni_k** (5/5): For my first bullpup, the RDB was impressively accurate straight away. It ran two twenty-round magazines and a forty-round magazine without a single issue, and the light feel at the shoulder makes the...

## Similar Products

- [Kel-Tec RDB Defender 5.56mm Bullpup Rifle - Tan Tactical Edition](https://gunsnation.com/p/kel-tec-rdb-defender-5-56mm-bullpup-rifle-tan-tactical-edition/UCBHbZO5w)
- [Kel-Tec RDB Defender - 5.56 NATO Bullpup, OD Green, 16" Barrel](https://gunsnation.com/p/kel-tec-rdb-defender-5-56-nato-bullpup-od-green-16-barrel/UCBHUnnWc)
- [Kel-Tec RDB Bullpup 5.56 NATO Semi-Auto Rifle - Black](https://gunsnation.com/p/kel-tec-rdb-bullpup-5-56-nato-semi-auto-rifle-black/UCBHUnmyM)
- [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)
- [Kel-Tec RDB-C Bullpup Rifle: Lightweight, 5.56 NATO, Black, 20.5"](https://gunsnation.com/p/kel-tec-rdb-c-bullpup-rifle-lightweight-5-56-nato-black-20-5/UCBHUnn1A)
- [Kel-Tec RDB-S Bullpup Rifle 5.56 NATO 16" Compact Shooter](https://gunsnation.com/p/kel-tec-rdb-s-bullpup-rifle-5-56-nato-16-compact-shooter/UCBHUnnMv)

---
*Data from [GunsNation](https://gunsnation.com)*