870 firing pin too short/not reaching ..hints?

If the firing pin retracting spring is broken it will wind up on itself and not hold the firing pin fully to the rear where it can be hit hard enough for the inertia to hit the primer with force..

...check that out first...

PS - you may find a broken firing pin... if the front breaks off it can on occasion stay in place and cause misfires... you will see when you remove it...
 
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I had a firing pin once that was not properly factory heat treated.It was soft enough to bend and compress at the point so that it wouldn't reach the primer anymore.I took the gun apart,carefully straightend out and rounded the pin and then had my gunsmith throw it in to his special oven the next time he had it cranked up.Although I ordered a new pin that day, I had my old one back within a few days (free) so it got installed first.That was ten years ago and it's still working fine.I was going to put my new pin in but the heat treating worked on the old one and it hasn't shrunk a thousandth. Firing pins that can get stuck IN could maybe get stuck OUT causing a slam fire and that would be bad.
 
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