Geissele Automatics 10169 Reaction Rod Steel AR-15 Upper Receiver

The Geissele Automatics 10169 Reaction Rod transforms AR-15 upper receiver work by eliminating stress on the receiver extension threads during barrel installation and removal. This precision-machined steel tool locks into the upper receiver's barrel extension, providing a solid mounting point that protects critical components during armorer-level maintenance.

What Makes This Different

Unlike traditional upper receiver vises that clamp onto the receiver itself, the Reaction Rod transfers torque forces directly through the barrel extension. This approach prevents damage to the receiver's aluminum threads and eliminates the risk of crushing thin-walled components. The tool handles up to 80 foot-pounds of torque without flexing, ensuring proper barrel nut installation every time.

Key Features

• Precision-machined 4140 steel construction for maximum durability
• Direct engagement with barrel extension eliminates receiver stress
• Compatible with all AR-15, M4, and M16 upper receivers
• Designed for .223 Remington and 5.56x45mm NATO chambers
• Knurled grip surface prevents slipping during high-torque operations
• Heat-treated steel withstands repeated professional use
• Works with standard bench vises and receiver blocks

Professional armorers rely on this tool for consistent barrel installations across multiple platforms. The rod maintains perfect alignment during barrel nut torquing, preventing the receiver damage common with improvised clamping methods. Law enforcement agencies and competitive shooters use the Reaction Rod for field-stripping operations that require precise reassembly. The tool's steel construction resists wear from repeated use in high-volume shops.

Technical Specs

• Material: Heat-treated 4140 steel construction
• Compatibility: AR-15, M4, M16 upper receivers
• Chamber specification: .223 Rem/5.56x45mm NATO
• Torque capacity: Up to 80 foot-pounds
• Surface finish: Parkerized for corrosion resistance
• Length: Approximately 8 inches overall
• Country of origin: United States

The Geissele Reaction Rod represents the professional standard for AR-15 upper receiver work. Its proven design prevents costly receiver damage while ensuring proper barrel installation torque specifications. This tool pays for itself by eliminating the risk of threading damage during the first barrel swap.