Hey guys. Dave here from NineX19. We ship all of our slides with one of our brass channel liners as an added value.
We have found the benefit to be two-fold. For starters, we undersized the OD of our channel liner ever so slightly. This allows for tool-less installation and removal for cleaning and inspection. Second, the brass provides a lower friction surface for the striker assembly than the original plastic and it's more resistant to chemicals and wear.
Will it provide any tangible performance benefits? Not likely. It's primarily a convenience item and a small reliability/longevity upgrade that some people appreciate.
