My first rifle was the Winchester model 74 22LR, had it for 65 years. At age 15 went into centerfire and hunting with father and freinds, they are no longer with us.
I dug out my 74, cleaned it up and took it to the range-- to my surprise-- it didn't shoot-- not know why. Took it to gunsnith-- they had it for 5 months-- then say-- because of the covid 19-- to busy for it-- so I took it back. They gave me a bag of busted springs and and broken firing pin-- that rotated. At first-- I didn't want to take the bolt apart-- not sure how to put it together--- but now won't hurt to look at it myself. I saw on the Youtube-- how to take the bolt apart and put it back together. I found on the internet-- gun parts-- that there seems to be many variations of what the firing pin should be. Most concerned about the little key-way on the mid part of the pin that keeps it orientation while cocking to keep the notch in position for the catching sear. I found on the internet-- many variations-- some with no keyway part and some with no thin little half inch long x 1/16 dia tail at the end of the pin(think that goes in the back stationay bolt-- that locks the bolt with pin is cockes-- so you can't press the bolt release to remove bolt when cocked). Anyway-- you can find correct firing pins from Midway--- they need fitting-- the tail peice dia and the firng pin end. You can find these 2 springs at Gunsprings. but again all this needs fitting. The problem seems to be to cut spring so they don't bunch up from the recoil and not allow travel to cock, and to keep the firing pin spring end from jamming into the back stationaly bolt into the notch and sear.
if that happens-- the gun is cocked and the safety end in the bolt-- keeps you from removing the bolt. it is very difficult to remove the total bolt . I was lucky.
I was thinking about removing that little tang at the end. My old pin did not have a tang. but the pins I tried without the tang-- had a tendency to jam a little
into this back small hole and dent the back of the pin and jam it tight. When the bolt and pin jump back after firing-- the pin may continue back after the bolt stops.
I was thinking--- pushing a stop into the little hole-- to stop the back on the pin from jamming. Agin-- my rifle nit not have a tang on the back pin-- it did have marks where it hit the little hole edges at the end-- but never had a problem. So now you have it-- the only last thing to say-- is your thumbs get sore from holding th springs back while reassem;e the bolt to put the slider stop pin back in place.