RR Spring

[SaddleUpLock&Load]

Dumb question. But been noticing some teams running a very strange looking RR spring. The coils begin being very close together and at the top look to have normal distance between the coils or vice versa. Havent seen how they go in. New to me. What are they accomplishing with this? Thanks

[HMS27]

Sounds like a progressive rate spring. It's like a normal spring on top but the more its compressed it becomes a very high rate.