Mike,
I'd just go with a stock one. I dry fire my training gun (2012 manufacture Glock 17 Gen 4) on an almost daily basis and the original striker is just fine. The gun itself has close to 43,000 rounds thru it.
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I had an OEM striker/circa 2005/Gen3 G35/ flatten (think Egyptian topped p-mid to Aztec) and start to produce light strikes at about 17K. All rounds fired were 165g or 180G
Speer with a smattering of 125g .357 sig using a dropin barrel.
YMMV
Why does ZEV sell an $80 striker and what's it supposed to do that the OEM doesn't?
I don't see it very often. In fact if we look at parts life in a Glock the striker gives me lesser concerns about maintenance schedules than many other parts in the Glock. I do however monitor the tip of any firing pin on a normal maintenance / user level inspection and teach this to all students. One of my Gen4 G17's which is a very early serial number is pretty much my own personal test mule. Small sample of just one pistol that I abuse, but overall it is my favorite Glock that I own. It has seen ~90K and may hit 100K by the end of the year. So far I have changed the ejector, extractor and RSA @25K to fix some issues problematic to early Gen4's, and around 75K changed striker and trigger springs to play with some combo's but everything was still going at that point. Right now same striker. I did polish internals which included the rear of the striker. Again this is only 1 pistol. I do however have a large number of Glock pistols to track, however they are fairly new in their lifespan.