Our bolt vise helps you disassemble your AR-15 bolt easily and without losing any parts. The main function of the tool is to compress the ejector so you can remove the spring pin easily. This enables you to release the pressure on the ejector slowly so the ejector and spring don't go flying off your workbench. The ejector and spring can be replaced if needed and the bolt reassembled easily. The tool cradles the bolt and holds it firmly in place while the screw assembly compresses the ejector. A hole in the vise allows the pin to drop free. The tool can also be used to hold the bolt securely while replacing gas rings and replacing the extractor. NOTE: We recommend you replace the ejector roll pin when reassembling. A 1/16" #1 ROLL PIN PUNCH is required to remove the pin.