Re: Remington 700 Firing Pin Spring (do they wear out?)
All springs will shorten with time, in the compressed state. Most bolt action rifles have more spring tension than is needed from the start. Too much tension on a firing pin can cause rifles to misteriously not perform. It has been noted on some actions heavy springs cause groups to open up. The only thing i would keep in check is the spring and pin assembly should be kept clean, lightly oiled with a non freezing type. Most rifle failures occur from bolts that haven't been cleaned for a long time, the oil will turn to a sticky varnish and in cold weather the missfires will happen. Numerous rifles were returned to my shop for warrenty and repairs from Rem. I never replaced a single spring the whole time. BUT, if you remove your spring and lay it next to a new one, i will bet you its shorter. Not the same subject but related, Rem 1100 shotguns, Browning A5's all have one thing in common, springs...when these start to have problems its due to springs. I have seen the A5 shotgun recoil spring shrink by 3" just from being compressed over the years. I allway tell the guys, when your gun is resting, loosen the forarm and take the pressure of the spring. Allways store your bolt rifles or any rifle for that matter with the hammer or pin dropped.
Many years of experience fixing problems