The 1-piece firing pin was added in 2018. Some believe them to be lighter. I do not; at least not like a mildly worked adjustable firing pin assembly. And that brings me to the second point. The 2018+ firing pins are non-adjustable. And they accept only thrust bearing style lift kits. (I prefer the single point). The spring used also lends to more light primer strike problems than that of the adjustable assembly style.
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