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The second generation firing pin was lightened up slightly and the firing pin spring as changed to a three-piece design that works out to a 22-lb. spring rate. This design change resulted in an issue where some users (10-15%) would experience light primer strikes that wouldn't always ignite the chambered round due to insignificant impact energy being delivered.
The current third generation firing pin was lightened up even more and has a noticeably different appearance to it - specifically at the front of the firing pin. Savage also updated the firing pin spring to a new 28-lb spring (green) to eliminate the aforementioned light primer strike issue associated with the second generation parts. This new heavier green spring is roughly about 1/4-inch longer than the previous spring, which when combined with it's heavier weight results in an extremely stiff bolt lift when installed (even more so than the first and second generation designs which weren't the lightest to start with.
The video below from Desh Industries provides a good visual depiction and explanation of these changes to the Axis bolt components over the years. More information about Desh Ind. andd the products they offer can be found on their website: https://deshind.com/
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