Not sure if It's the same with vsr guns as opposed to AEG guns. But the thing people like about the R-hop is that you can use soft buckings (keeps a good air seal) because the R-hop still gives you the advantage of using heavier bb's but having a soft bucking (for air seal). Again I'm not 100% sure if it works the same with the vsr style system, but if I had to guess I would say it will. So you should pick the softest bucking.