Must admit defeat!!!! I got a new spring (wolff) and since that time have had not one failure! I will tell you that the Sig springs are PURE JUNK!!! I will also tell you that the springs in the mags are also JUNK!!!!! Got the new Wolff ones and not one failure. SIG jumped the hell out of this one and what they gave us was first NOT TESTED and second simply a COPY of somthing that ruled the market! I love SIG but hate the hell out of a lie!