The one that comes with it is a soft one. It's not that great, not much friction.
I reccomend you buying Prometheus NEO strike camber along(You need to use original gears from the hop up unit you have right now) with Prometheus hop up rubber(or systema).
One of my client had one installed and each shot went almost the EXACT same path the last shot. It was quite amazing, range was like 180ish feet too!
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