It's been a while but I think JJ is right. I think the D'back is shorter but that the Viper and the Diamondback both take SA 700 springs. Someone correct me if I'm wrong but I had a Viper and had some ignition issues with it. Stiller stood behind the main issue but I still had to play with springs a bit. Pretty sure they were 700 springs in it. My issue was a bent fp tip from improper heat treat. Jerry sent a new pin and springs but it was fluted and it came to life with the Wolffe extra power 700 spring but I don't recall the weight. It's been a few years!24# Remington 700 sa spring