The recoil spring looks exactly like my gen 4 springs and nothing like my gen 3 glock 26 spring. Was there some kind of upgrade in 2012 Im not familiar with.. this gun is really really accurate but wow there is some snap to it..
What numbers are stamped on the end of the guide rod? Best thing to do would be call Glock up tomorrow. Ask them what the proper/most up to date spring assembly for your gun is. They will ask you the serial and tell you what you should have. Tell them the numbers on your spring. If you have the wrong spring they will more than likely just send you the right one free of charge. I've talked to them a few times and they have been pretty easy to deal with.
That does look like the RSA from my Gen4, as opposed to the one on the wife's Gen 3 (solid sleeve under the larger front spring). Although I didn't actually measure, the hole in the slides appear to be the same size. I can swap the spring back and forth between the two, so someone could have swapped the RSA.
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