You'll have a hunt ahead of you, took about a year before I found a bolt for a Mossy 146B and sold off a Remington 511 when I couldn't find a bolt for less than I spent on the bolt-less gun. I checked Jack First, Numrich, Homestead gun parts, Ebay and nada for 72A, you may want to set up a search alert on eBay and email other parts dealers so you're at the front of the line. Cheapest out of stock listing I found was about $150 for a bolt. There's a couple of pretty good parts guys at the Gettysburg shows and sometimes at Chantilly at Nation's Gun Show. I wish you good hunting