there are lots of high quality heads on the market now. Muzzys beging one of the best. Innerlocs are also great head, but not sure if they are enough differnt than the Muzzys to bother changing. I honestly feel muzzys are one of the best heads you can buy. If you just feel like switching, take a look at the Magnus stinger 4 blade 100 grn. It' s an excellent head, and every bit as good as the Muzzys 4 blades.