Found that both my 5.45 ARs lately have been having light strikes shooting 5.45, I'm assuming my heavy hammer springs are starting to lose some tension.   Looking at replacing them with Giesselles, but wanted to know if the cheaper line, the G2S will also reliably fire surplus as I hear the SSA trigger does?

Mine work well with 7n6.

Don't a lot of people running 5.45 pick up a slightly longer firing pin? Or do you already have one?

Both my SSA and SD-C were 100% on my 5.45.  I think the G2S is a very safe bet.  GI firing pin here, works great!

I think it may be a bad lot of 5.45; I have a G2S in my M&P15R and it was 100 percent reliable until I opened a new spam can, now quite a few dead primers.

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.

An extended firing pin is fairly common in 7.62x39 builds. They are only .010 longer, before they were available it was common to shave the tail of the bolt to allow more protrusion.

 

If you are having light strikes I would recommend both the extended firing pin and an extra power hammer spring.

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.

I just learned something.  As I'd noted, the 5.45 upper makers all mention (and often supply) the stronger hammer spring, but never a longer firing pin.

The biggest problem with foreign 5.45x39 is that it is made all over the place when looking at charge weights and consistency in the components.

what are the markings on your tin?

Don't have the can anymore, just the paper wrapped cartridges