Masterpiece Arms Defender 9mm Side-Cocking Pistol MPA30SST
The Masterpiece Arms Defender 9mm Side Cocking Pistol MPA30SST is a 9mm side-cocking semi-automatic pistol featuring a 6-inch threaded barrel, CNC-machined aluminum lower receiver, adjustable rear sight, and scope mount. This configuration is finished in matte black and includes a short lower receiver rail, standard safety extension, and 30-round polymer magazine.
Masterpiece Arms Defender 9mm Features
- 9mm caliber
- Blowback semi-automatic operation
- 6-inch threaded barrel
- 1/2×28 barrel thread
- Side-cocking configuration
- Top scope mount
- Lower receiver short rail
- Standard safety extension
- Adjustable rear sight
- CNC-machined aluminum lower receiver
- 30-round polymer magazine
- Matte black finish
- American made
MPA30SST Side-Cocking Configuration
The MPA30SST Defender uses a side-cocking configuration and blowback semi-automatic operation. The model is equipped with a top scope mount and an adjustable rear sight.
Masterpiece Arms Defender 9mm Side Cocking Pistol Barrel and Receiver
The Defender features a 6-inch threaded barrel with a 1/2×28 thread specification. The lower receiver is CNC machined from aluminum, forming a key part of the construction of this configuration.
Controls and Mounting Features
This configuration includes a standard safety extension, adjustable rear sight, top scope mount, and a short lower receiver rail. The mounting interfaces should be verified for compatibility with any accessory before installation.
Magazine Configuration
The Masterpiece Arms Defender 9mm Side Cocking Pistol is chambered in 9mm and the supplied configuration includes one 30-round polymer magazine. Magazine compatibility and capacity requirements can vary according to applicable laws and regulations.
Masterpiece Arms Defender 9mm Specifications
| Specification | Details |
|---|---|
| Manufacturer | Masterpiece Arms |
| Model | MPA30SST |
| Series | Defender |
| Caliber | 9mm |
| Action | Blowback Semi-Automatic |
| Barrel Length | 6 inches |
| Barrel Thread | 1/2×28 |
| Cocking Configuration | Side Cocker |
| Receiver | CNC-Machined Aluminum Lower Receiver |
| Scope Mount | Top Mount |
| Lower Rail | Short Rail |
| Safety | Standard Safety Extension |
| Rear Sight | Adjustable |
| Magazine | 30-Round Polymer Magazine |
| Finish | Matte Black |
| Country of Manufacture | United States |
What’s in the Box
- MPA30SST 9mm Pistol
- One 30-round magazine
Product Identification
Manufacturer: Masterpiece Arms
Model: MPA30SST
Series: Defender
Caliber: 9mm
Barrel Length: 6 inches
Barrel Thread: 1/2×28
Operation: Blowback Semi-Automatic
Cocking System: Side Cocker
Receiver: CNC-Machined Aluminum
Finish: Matte Black
Important Product Information
Specifications, included components, magazine capacity, and configurations may vary by production model. Verify the exact specifications with Masterpiece Arms or authorized documentation. Always comply with applicable federal, state, and local laws and regulations concerning firearms.




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