I just got back from our local indoor range and am miffed at my 27, This is the one i have been using as my CCW, I carry the standard 9rd mag in but for a reload I carry the 15rd, When I fired my 27 to lock back I inserted the 15rd mag and slingshotted the slide,now the fun begins, it didnt feed, I had to pull the slide back and lock it open on the slide release. I thought hmm ok, tried it again, same thing. locked it open and used the slide release same thing, slide moved forward and FTF. I removed the 15rd mad and tried all the above with the 9rd mags no problems, slingshot or pressing slide release fed everytime. Any thoughts or ideas? I will be turning this over to our armorer but maybe someone can give me a little insight.