The Geissele Reaction Rod is a purpose-built gunsmithing tool for work on .223 Rem / 5.56x45mm AR-15/M4/M16 uppers. It holds the barrel extension from rotational movement by engaging the extension’s splines, allowing torque to be applied to the barrel nut and related components without stressing the receiver. The rod’s steel construction and splined engagement reduce the need to clamp the receiver and help prevent marring of receiver finishes and rails. Designed to be used in a bench vise, it streamlines installation and removal of barrels, gas blocks, flash hiders and handguards.
Key Specifications
- Compatible caliber is .223 Rem / 5.56x45mm NATO.
- Constructed from steel for workshop durability.
- Intended for use with AR-15 / M4 / M16 upper receivers.
- Product type is a Reaction Rod for gunsmithing tasks.
- Finish and color are black.
- Mounting method uses a bench vise and integral splines to engage the barrel extension.
- Primary function is barrel, gas block, flash hider and handguard installation/removal.
- Manufacturer model reference is Geissele Reaction Rod (10169).
Simple, robust and engineered for workshop use, the Reaction Rod removes the need to clamp or torque the receiver during upper-level maintenance. It helps preserve receiver finishes, protects indexed receiver surfaces, and makes routine and advanced gunsmithing tasks faster and more repeatable. For any AR-15 owner or armorer performing barrel changes or upper assembly work, this tool is a practical addition to the bench that focuses on repeatable, low-damage results.
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