I can’t answer your question on the Volquartsen bolt but I wonder why you need one. I have about 50,000 rounds through my 15-22 with no problems associated with the factory bolt. It cleans easily and four drops of oil is all the lube it needs. I do have a spare factory bolt in the drawer, just in case, but I doubt I’ll ever need it. The factory bolt costs less than half the price of the Volquartsen.