Magpul MAG536-BLK BEV Block - Polymer & Steel Support for AR-15/M4 Upper & Lower Receivers

The Magpul MAG536-BLK BEV Block is a dual-purpose AR-15/M4 vise block that handles both upper and lower receiver work without needing separate tools. Whether you're installing a barrel nut, swapping flash hiders, or performing routine maintenance, this compact gunsmithing tool secures your receivers safely in a bench vise so you can work hands-free with confidence.

Built with purpose-driven materials, the BEV Block uses hardened steel lugs and a full-length support shank to grip the barrel extension solidly without flex—critical when you're applying torque to barrel nuts or muzzle devices. The polymer engagement surfaces protect your aluminum receivers from marring, and the included pin keeps your upper in proper position while you work. An O-ring post accepts your bolt carrier for added stability during assembly operations.

The real versatility comes from its reversible design: flip it over and it becomes a lower receiver vise block for mag well work, cleaning, and other maintenance tasks. This two-in-one approach means serious builders and gunsmiths get maximum functionality from minimal bench real estate. Made in the USA and designed by Magpul to handle both billet and forged uppers, it's the kind of tool that pays for itself after a few builds.

Key Features

• Supports all AR-15/M4 upper receivers (billet and forged)
• Hardened steel barrel extension engagement with full-length support shank prevents flexing during torque operations
• Polymer surfaces protect aluminum receivers from damage
• Reversible design: upper receiver vise block on one side, lower receiver mag well block on the other
• Bolt carrier O-ring post provides additional stability
• Included pin maintains upper receiver alignment
• Compact footprint for bench vise mounting
• USA made

Specifications

Frequently Asked Questions

Will the BEV Block work with my billet and forged upper receivers?

Yes. The BEV Block is designed to support both billet and forged AR-15/M4 upper receivers securely in a vise.

Can I use this for both upper and lower receiver work?

Absolutely. The BEV Block is reversible—one side engages the barrel extension for upper receiver assembly and torque work, and you flip it over to use the mag well vise block side for lower receiver maintenance and assembly.

What's included in the box?

The Magpul MAG536-BLK includes the vise block tool itself, a pin for upper receiver alignment, and an O-ring post that accepts your bolt carrier for added stability.

Will this tool damage my receivers?

No. The hardened steel is optimized to grip firmly without marring, and all engagement surfaces that contact aluminum receivers are made from Magpul polymer to protect your finish.