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You can find a replacement firing pin for a Stevens model 87D 22 cal rifle at a gun dealership. You can also find it by contacting the manufacturer.
Best left to a gunsmith
There were two types of firing pin used on that model. Would need to see the bolt, but we have the pin. gunshop@nctv.com
Use a Marlin 57 firing pin. It's the same rifle, just re-branded for Sears.
Believe that is a Marlin 101. Contact Numrich at their website- gunpartscorp. They list that firing pin for $5 plus shipping,
gun shop, e-gunparts.com, gun shop
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try numrich arms co first,they can be found on the web.
Numrich Arms
Find a good gunsmith or machinist
A firing pin that is mounted on/in a hammer