Progressive vs stack

[Aggressor]

Is the 175-350 progressive spring same as running a 175-350 stack?

[MasterSbilt_Racer]

Is the 175-350 progressive spring same as running a 175-350 stack?

No. You can't adjust when a spring changes rate. And the transition from soft to stiff rate will look different as well.

[Basecircle]

If you stack them, without a lockout, it will just act like a non-progressive approx. 117lb spring. If you run a lockout, it will be a 117 until it hits the lock, then switch instantly to a 350. A progressive is just that.... progressive.