Mossberg. They are in business, and have a website. Try Customer Service.
Does not exist.
No. .22 Magnum and .22 Long Rifle are not interchangeable.
Need a detailed description
Unfortunately only a Mossberg single shot rifle from that era would interchange. Your rifle was made between 1960-1968. If you contact Havlinsales through their website, they could advise you on the availability of a replacement stock.
No published sn data.
No, the 22 Mag will not fit.
10-1000 USD and up depending on specifics.
"Tactical Rifles" are intended for offensive or defensive use at close range, with fairly instant results. Under pressure, tactical rifles are typically used when all other precautions have failed and lives are in danger.
Do not attempt to use other than a Mossberg bolt made for that rifle.
.22 Long was developed @ 1871, Uses the same case as the 22LR but with a 29 g bullet. ,22 Long Rifle developed by Peters Cartridge in 1887. Uses bullets in the 32-40 g range
A Mossberg 22 rifle such as the Plinkster depending on the condition is worth around $150-200.
50-500 usd