The Geissele AR15/M4 Reaction Rod is a precision-machined upper receiver vise block designed for armorer-level work on AR-15 and M4 platform rifles.
- Platform: AR-15/M4
- Material: Heat-treated steel
- Indexing Method: Barrel extension lugs
- Compatible With: Mil-spec AR-15/M4 upper receivers
- Use: Barrel installation/removal, muzzle device torquing, rail installation
- Vise Required: Standard bench vise (not included)
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