ProMag PM123 AR-15 Lower Receiver Vise Block - Black Polymer

The ProMag PM123 Lower Receiver Vise Block eliminates the need for expensive specialized tools when performing maintenance, modifications, or builds on AR-15 and M16 platforms. This precision-molded polymer block securely holds lower receivers in standard bench vises without damaging the finish or components.

What Makes This Different

Unlike universal vise blocks that require multiple adapters, the PM123 features a contoured design specifically engineered for AR-15/M16 lower receiver geometry. The polymer construction prevents marring of anodized surfaces while providing the rigid support needed for trigger group installation, buffer tube threading, and pin removal. Standard steel blocks can scratch receivers and lack the precise fit this dedicated tool provides.

Key Features

• Precision-molded polymer construction prevents scratching and marring
• Contoured design specifically fits AR-15/M16 lower receiver profiles
• Compatible with standard bench vises up to 6 inches wide
• Non-slip texture provides secure grip during heavy-duty operations
• Lightweight at 8 ounces for portable gunsmithing setups
• Chemical-resistant polymer withstands cleaning solvents and oils
• Integrated channel accommodates trigger guard without interference

The PM123 maintains receiver alignment during critical operations like buffer tube installation, which requires significant torque to achieve proper 35-40 foot-pound specifications. The block's rigid polymer construction distributes clamping force evenly across the receiver's magwell area, preventing deformation while allowing full access to pivot pins, trigger components, and the buffer tube threads. Professional gunsmiths and serious enthusiasts rely on this tool for consistent, damage-free work on multiple platforms.

Technical Specs

• Material: High-impact black polymer construction
• Compatibility: AR-15, M16, and compatible lower receivers
• Vise compatibility: Standard bench vises up to 6 inches
• Weight: 8 ounces
• Dimensions: 4.5" x 3.2" x 2.1"
• Color: Matte black finish
• Manufacturer: ProMag Industries

The PM123 transforms any standard bench vise into a professional-grade receiver holding fixture. This specialized tool pays for itself on the first build by preventing costly finish damage and ensuring proper component alignment throughout the assembly process.