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Geissele AR-15/M4 Reaction Block

The Geissele Automatics AR-15/M4 reaction block is an all steel part that can assist in a variety of lower receiver operations.

WARNING: Never attempt to disassemble or reassemble a firearm unless you are absolutely certain that it is empty and unloaded. Visually inspect the chamber, the magazine and firing mechanism to be absolutely certain that no ammunition remains in the firearm. Disassembly and reassembly should follow the manufacturer’s instructions.

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