Geissele 05-314 AR15 Reaction Block Assembly Tool
Geissele Automatics precision assembly tool for AR15 lower receivers. Provides stable platform with 90-degree positioning increments and frees both hands for faster, easier builds.
Geissele Reaction Block: Professional-Grade Assembly Tool
The Reaction Block represents a thoughtful solution to a genuine problem in AR15 assembly—the need for a stable, hands-free work platform when installing critical components into your lower receiver.
How It Works
Once you've installed your buffer tube, simply slide your lower receiver into the Reaction Block at any of four positions: 12, 3, 6, or 9 o'clock. Loosen the provided nylon screws, remove the receiver, and reposition it at your desired angle in 90-degree increments. This flexibility allows you to access every surface of your lower receiver without constant repositioning.
Key Features
- Stable Platform: Engineered to hold your lower receiver rock-solid during assembly operations
- Four-Position Design: Rotate your receiver in 90-degree increments for complete access
- Hands-Free Operation: Both hands remain free for installing components, driving screws, and torquing fasteners
- Buffer Nut Installation: Makes the critical buffer retainer nut installation quick and straightforward
- Quality Construction: Built from steel with precision nylon adjustment screws
- Time-Saving: Eliminates the frustration of jury-rigging work-holding solutions
The Practical Advantage
Whether you're a professional armorer or a dedicated hobbyist, the Reaction Block transforms lower receiver assembly from a two-handed juggling act into a controlled, efficient process. Your work quality improves when you can focus on the task at hand rather than keeping your receiver from rolling away.
