I had a 16 lb wolf spring in my 97B and it ran ok with it, it only ejected the cases about 3 feet from the gun, but me being a reloader that part is great. I tried an 18 lb spring in it which is the same weight as my full sized 1911's and it ran good with it as well and had about the same ejection pattern. What weight are you guys running for a recoil spring, what would you consider to be to heavy of a spring weight?