I was at a gun store I don't usually go to earlier today. I bought a holster for my gen.3 G-30, but before I paid I asked if I could try it on with one of the G-30's they had there. Then I asked if I could remove the slides on the G-30, and 29 they had in the case to compare the difference, or non-difference in the inner parts. I noticed both guns recoil spring assembles then mine. They looked similar, except around the large spring there was a metal casing that had cut outs were the large spring could be seen. Has anyone seen anything like this before.