ProMag PM123A Lower Receiver Vise Block Set Black Polymer Rifle AR-15, M16 3 Pieces
- Firearm Group:
- AR Platform
- Model:
- Lower Receiver
- Material:
- Polymer
- Model Fit:
- Polymer
The ProMag PM123A AR-15/M16 lower receiver vise block set is a three-piece clamping system built to keep your receiver stable and damage-free during assembly, disassembly, and maintenance. Whether you're working on your flat-top or carry-handle upper and lower receivers, these polymer blocks secure your components firmly in a bench vise so you can focus on the work—not holding things steady. The set's impact-resistant design handles the rigors of the gunsmith's bench and the home shop alike.
Made from glass-filled nylon, each block is engineered to distribute clamping pressure without marring your receiver's finish. Unlike steel clamps that can ding and scratch, these polymer blocks cradle AR-15 and M16 components with the security you need and the protection your firearm deserves. The three-piece configuration gives you flexibility to support both upper and lower receiver work, making this a practical addition to any AR platform builder's toolkit.
This is the kind of accessory that makes the difference between a clean, professional job and one marked by vise marks and frustration. If you're serious about keeping your AR-15 or M16 in top condition, or you're building and customizing with precision, these blocks are worth having in your shop.
Key Features
- Three-piece set for comprehensive receiver support during work
- Impact-resistant glass-filled nylon protects receiver finish from marring
- Designed for both flat-top and carry-handle AR-15/M16 upper and lower receivers
- Secures components in bench vise for hands-free stability
- Suitable for assembly, disassembly, and maintenance tasks
Specifications
| Brand | Pro Mag |
| Model | PM123A |
| Piece Count | 3 |
| Material | Glass-filled nylon polymer |
| Color | Black |
| Compatibility | AR-15/M16 receivers (flat-top and carry-handle) |
Frequently Asked Questions
Will these blocks work with both my upper and lower receiver?
Yes. The three-piece set is designed to support both upper and lower receiver components on AR-15 and M16 platforms with either flat-top or carry-handle configurations.
What's included in this set?
The PM123A is a three-piece set of polymer vise blocks designed to work together to clamp and stabilize receiver components.
Can these polymer blocks damage my receiver finish?
No. The blocks are made from impact-resistant glass-filled nylon, which is softer than metal and designed to protect your receiver from marring or scratching during vise clamping.
What tools do I need to use these blocks?
You'll need a standard bench vise to secure the blocks and receiver together. The blocks themselves require no special tools to use.

