# Masterpiece Arms Defender 30K 9mm 4.5in Grey/Black

**Brand:** MasterPiece Arms
**Category:** Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 4.5"
- **UPC:** 866803032620
- **SKU:** UCFG9ZBiW

## Description

The Masterpiece Arms Defender 30K is a semi-automatic pistol-caliber platform chambered in 9mm, built around a 4.5-inch threaded barrel (1/2x28) with a side-charging handle. It accepts Glock-pattern magazines and ships with a 30-round magazine, and includes a side-folding hinge with a buffer tube adapter for mounting a compatible brace or stock. The trigger system pairs the Defender bolt with a standard AR-15 fire control group.

### Key Specifications
- **Brand:** Masterpiece Arms
- **Model:** Defender 30K
- **Caliber:** 9mm
- **Action:** Semi-Automatic
- **Capacity:** 30+1
- **Barrel Length:** 4.5 in
- **Color:** Grey/Black

### Detailed Features
- 4.5-inch threaded barrel (1/2x28) accepts standard muzzle devices
- Side-charging handle keeps the top of the receiver clear
- Accepts Glock-pattern magazines, ships with a 30-round magazine
- Side-folding hinge and buffer tube adapter allow a compatible brace or stock to be added

## What Customers Say

*AI-generated insights from customer reviews*

Owners of the Defender 30K describe it as remarkably compact for a pistol-caliber build, and the side-charging handle draws consistent praise for keeping the top of the receiver clear of a reciprocating handle. Some new owners note the side-folding hinge takes practice to lock in place confidently, but most consider it a minor learning curve rather than a flaw.

Because it runs on Glock-pattern magazines, shooters like being able to reuse magazines they already own from other guns in their collection. The steel upper paired with an aluminum lower draws mixed reactions: some like the balance it gives the platform, while others feel the front end is barrel-heavy at first pickup.

Aftermarket support for the platform is a common talking point, with owners appreciating the ability to swap braces, optics, and handguards to fit their preferences. The overall consensus is a dependable, if niche, pistol-caliber build that rewards owners willing to build it out.

## Pricing

**3 offers available**

| Vendor | Price |
|--------|-------|
| Classicfirearms Com | $799.00 |
| Buds Gun Shop | $899.99 |
| Grabagun Com | $899.99 |

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