Your question has 2 parts - as Azathoth explained the IR hop is meant to be resilient and stable in cold temperatures than the R-hop. If you're playing in warmer climates it doesn't make a difference - installed correctly.
The ER hop vs standard R-hop allows a longer contact length at the expense of extensive modification of your hop-up unit. With this extended contact patch, less hop needs to be applied which theoretically = less FPS loss due to hop. It will also = longer dwell time of the BB = better round stabilization.
We have IER Z-kits in stock and ready to go.. I think. If not, as authorized HS5 Gold-level Dealers, we can get them in under 1.5 weeks time. PM me and we'll get you sorted out.
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