I use the Disco Striker spring. Maximus Striker spring is stupid heavy IMO. $75 for Gen II Brake and/or Tune Each. I like the Maximus. It has a 2" longer barrel so it has about a 25 FPS advantage to the Disco, with restricted TP, it is more consistent as well. My accuracy tune with (choked/crowned) barrel work and extended bolt probe work.
I think it is the best bargain in the Crosman/Benjamin lineup. Superlight so everyone can handle it easy.