Brownells AR-15 Front Sight Bench Block
This video segment is a description of the AR-15 Front Sight Bench Block and its purpose.
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.