# Maxim Defense PDX .300 Blackout 5.5" FDE Tactical Pistol Kit

**Brand:** Maxim Defense
**Category:** Rifles
**Caliber:** .300 AAC Blackout

## Specifications

- **Caliber:** .300 AAC Blackout
- **Barrel Length:** 5.5"
- **UPC:** 680017478285
- **SKU:** UCByGi2NJ

## Description

The Maxim Defense PDX Pistol Kit is an upper and brace package chambered in .300 AAC Blackout with a 5.5-inch barrel. The extremely short barrel makes this one of the most compact .300 BLK platforms available, and the Flat Dark Earth finish runs through the whole kit.

### Key Specifications
- **Barrel Length**: 5.5 inches
- **Caliber**: .300 AAC Blackout
- **Condition**: New in Box
- **Finish Per Color**: Flat Dark Earth
- **Manufacturer**: Maxim Defense Industries
- **Manufacturer Part Number**: MXM-47828
- **Model**: PDX Pistol Kit (Upper and Brace Only)
- **Type**: Uppers
- **UPC**: 680017478285

### Detailed Features
1. **5.5" Barrel**: The short length prioritizes compactness and close-quarters handling. Terminal ballistics from a 5.5" .300 BLK barrel are meaningfully different from longer configurations. Subsonic loads still function well, but supersonic velocities are reduced compared to a 10" or longer barrel.
2. **.300 AAC Blackout Caliber**: Runs both supersonic and subsonic loads from the same bolt and magazine as a standard AR-15. Subsonic .300 BLK from this barrel length is well-suited for suppressed use.
3. **Flat Dark Earth Finish**: Durable coating throughout the kit.
4. **Kit Format (Upper and Brace Only)**: Ships without a lower, giving you flexibility to build on an existing AR lower or source one separately.

## What Reviewers Say

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

> The practicality of 5.56 getting that short really limits you now it's still going to be lethal but I find that it's just it makes me violently angry.
>
> — [Micah Mayfield](https://www.youtube.com/watch?v=z5eFmhtqTyE&t=324s)

> Suppressor sounds so good it's hard to communicate through the camera.
>
> — [Micah Mayfield](https://www.youtube.com/watch?v=z5eFmhtqTyE&t=857s)

> I'm not going to lie it does have its flaws.
>
> — [Micah Mayfield](https://www.youtube.com/watch?v=z5eFmhtqTyE&t=1796s)

> Look this takes AR mags and has 100% AR controls and delivers more of a punch than any pistol caliber carbine out there.
>
> — [Micah Mayfield](https://www.youtube.com/watch?v=z5eFmhtqTyE&t=1906s)

> Sometimes I've noticed upon dropping bolt it might just go like that it might just stop.
>
> — [Micah Mayfield](https://www.youtube.com/watch?v=z5eFmhtqTyE&t=1828s)

## What Customers Say

*AI-generated insights from customer reviews*

Discussions about the Maxim Defense PDX in .300 Blackout with the 5.5" FDE brace kit tend to be enthusiastic about the concept, with some practical concerns mixed in.

The compact design and build quality get consistent praise. Users appreciate how light and maneuverable the PDX is, and the FDE finish gets positive comments for its appearance. For home defense and suppressed use, the short barrel and .300 BLK combination is the main draw.

The .300 Blackout round's versatility is a frequent topic. The ability to run subsonic loads suppressed is what attracts many buyers to this specific platform, and most users report it performs as expected in that role.

On the critical side, recoil management with a 5.5" barrel comes up regularly. Some users find it easy to handle, while others, particularly less experienced shooters, note that rapid fire requires more attention than with longer barrels. Noise levels without a suppressor are also mentioned as a consideration.

Price is the other main point of discussion. The PDX sits at the higher end of the market, and whether the premium over more conventional short-barreled builds is justified depends heavily on how much value a buyer places on the Maxim system's design.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Grabagun Com | $1671.99 |

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