1U Rails - 9X420 K3178 - which came first

Question

Hopefully a simple question. I have sets of 9X420/9X421 and K3178/K3179 1U Rapid Rails for the PE1650, 1750, 850, etc. the only thing i can tell is different is the release mechanism (mid-rail) to push them back in (one is a square hole with an inset, on is an exposed tab) and the pivoting catch that keeps the inner rail extended.  functionally they're identical, but given the notion that latest is greatest, i'm curious which design was released first. If anyone knows Thanks B

reybeast1 · Accepted Answer

9x420/9x421 released first.

beekerc · Answer

Thanks Rey, btw, you wouldn't happen to know which version of the 2650 rails came first?  the one with the matte black inner rail or the shiny, silver/metalic inner rail. B

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