Geissele Automatics Reaction Block – AR-15/M4/M16 Lower Receiver Assembly Tool, Black Steel, 05314

Product Description

The Geissele Reaction Block is a professional-grade tool designed to aid in the assembly and servicing of AR-15/M4/M16 lower receivers. After the buffer tube is installed, the lower can be slid into the Reaction Block at the 12, 3, 6, and 9 o’clock positions, allowing quick 90-degree rotations by loosening the provided nylon screws and reorienting the receiver. This ultra-stable platform keeps both hands free, making tasks like installing the buffer retainer nut faster and easier while reducing the risk of marring or misalignment. Built from durable black steel, it’s a dependable fixture for armorers, gunsmiths, and serious enthusiasts.

Product Highlights

• Ultra-stable platform for AR-15/M4/M16 lower receiver operations
• Quick 90-degree rotation via 12/3/6/9 o’clock insertion points
• Secures receiver with included nylon screws for hands-free work
• Simplifies buffer retainer nut installation and other lower tasks
• Durable black steel construction for long-term shop use

Specs

• Product Type: Reaction Block / Lower Receiver Assembly Tool
• Compatibility: AR-15, M4, M16 lower receivers
• Material: Steel
• Finish/Color: Black
• Included Hardware: Nylon screws
• Orientation & Rotation: 12, 3, 6, and 9 o’clock positions; 90-degree increments
• Weight: 1.61 lb
• UPC: 854014005984
• Manufacturer Part Number: 05314
• Brand Name: Geissele Automatics

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