The CM Tools bolt vise helps you disassemble your AR-10 bolt without fuss. The screw assembly face fits perfectly into the bolt face to compress the ejector so you can remove the spring pin easily. A perfectly aligned hole in the vise allows the pin to drop free. Once the pin is removed, slowly back off the screw assembly to remove the ejector and spring for cleaning, maintenance, or checking headspace. When doing this kind of work you should always inspect your spring to determine when it's time replace the ejector spring pin when reassembling. It is good practice to keep your bolt functioning properly.