This video features Caleb Savant, a Brownells Firearm Support Technician, demonstrating the Geissele Automatics AR-15 Reaction Block. The tool is designed to securely clamp an AR-15 lower receiver in a bench vise via the receiver extension (buffer tube), allowing for detailed work on components like the trigger, magazine release, bolt release, and safety selector. Machined from billet aluminum, it uses three non-marring polymer setscrews to lock the receiver extension in one of three positions. The video specifies that the Reaction Block is compatible only with mil-spec 1.14-inch O.D. receiver extensions. It also directs viewers to Brownells' extensive video library for more gunsmithing advice.
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