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If you mean a Remington 514 series bolt action rifle, the extractor is L shaped, and pulls straight out from the side of the bolt. If not careful you will lose the extractor plunger and spring. I would take it to a gunsmith- getting the new one in requires fitting.
You make sure the gun is unloaded. Open the bolt. When the bolt stops, look at the lower left of the bolt and you will see a small lever next to the extractor. With a small screwdriver, press the small lever down and at the same time pull back on the bolt, The bolt will slide right out.
Contact the Remington Custom Shop
A Remington Mod 8 in 95% conditiion is about $500.00
Shotgun no, bolt action rifle yes (1936-55). But I don't believe any smoothbore so if there's not rifling it's shot out or modified.
Bottom of receiver in front of trigger
100 years (approx) sn pa20568
100-1000 USD depending on specifics
Age.
Photocopies can be found on ebay.
A change in the breech bolt mechanism.
use an impact and it will break the bolt lose. You will have to mod or buy a tool to torque it down to spec