Has anyone used this?
if so what's your opinion on the multiple springs---instructions say white is standard,red 10% higher and gray 10% lighter--I usually shoot low velocity 22lr so I'm thinking grey is for my use

I currently have the Kidd in three rifles now and I have only ever used the standard red. Never had a reason to try the others. But if I wanted to get one to cycle with the 710-750fps varieties, I would experiment with the lighter springs; along with a lighter bolt. Most of the ammo I shoot is in the 1050fps neighborhood.

What is your defn of low velocity 22lr? Just below SOS?