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.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.