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A "longer firing pin" sounds dangerous. What most 5.45 upper makers suggest is a "heavy hammer spring." It's because those Commie corrosive primers have very hard cups and you really need to hit 'em hard. A longer firing pin won't do that.
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Don't a lot of people running 5.45 pick up a slightly longer firing pin? Or do you already have one?
A "longer firing pin" sounds dangerous. What most 5.45 upper makers suggest is a "heavy hammer spring." It's because those Commie corrosive primers have very hard cups and you really need to hit 'em hard. A longer firing pin won't do that.
Start with all milspec and then move up the ladder. Enhanced firing pin next because it does not have an effect on your trigger pull. Lots of AR 7.63/5.45x39 BCGs are sold with the enhanced firing pin included. Lastly the increased power hammer spring.
Geissele trigger groups are advertised as being able to ignite the Russian primers. My ALGs work fine with the enhanced firing pins and no increased power hammer springs.
If you notice, some of the Russian/steel ammo has primers that are set deep and no amount of hammer spring pressure will ignite the primmer. The firing pin collar will stop any further forward travel, so the enhanced firing pin precludes this problem.
I recommend to stay away from the extra power spring, but some builds you can't.