numrich arms(gunpartscorp.com) has a great deal of arisake parts in inventory, most of them are current production but they do get original parts in from time to time. I would personally get one of these
and use that to make the gun fireable and buy original parts as they become available to repair the original bolt.
all guns lost in a tragic smelting accident.
I never said half the crap people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin
Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.