Do not attempt to use other than a Mossberg bolt made for that rifle.
You will have to ask a gunsmith
while many of the bolts for OTHER Mossberg 22 rifles from the same period may fit, no bolt is a "drop in" part. ANY replacement bolt will need to be checked for fit and headspace. Too little, the bolt will not close on a cartridge- too much, and the rifle can be damaged (and so can you). This is one that REALLY needs to go to a true gunsmith for help. Perhaps the most knowledgeable man on Mossbergs is Mr. Victor Havlin- I have included a link below to his website- and his wife Cheryl is also a very smart lady- they run the Mossberg Collectors Assoc.
You get what you pay for. Find out how many differnet brands will fit and by the best you can afford.
No
It may not even fit an 1891 Mauser. Bolts are not a "drop in" part- they may require fitting (headspacing) to that individual rifle. That is where a gunsmith earns his pay.
no
Not likely. The 930 is a gas operated semi-automtic. The 500 is a pump.
i noticed the mossberg 500 airsoft mag can but i cant find any
No
no. you cannot change bolts rifle to rife without being head spaced. even if they fit you never do this.
No
Check Mossberg Customer Service thru their website. They will need the serial number of the gun in question- model changed during production.