I was told the 4th Gen Glock 29s are out now, but I haven't seen one in person. I know the Gen 4's had issues in 9mm for a while. I was told the grip is the same diameter between the 29SF and 4th Gen 29, but again I can't see one in person before ordering one from my shop. Have the 4th gen 29s had any issues like the 29/30 and 29SF/30SF had with failure to return to battery? they take the same magazines, but what other parts are different in them? I'm guessing the recoil springs are different? Are the grip angles the same, just the 4th gen is much more grippy? Load me up with any other changes they've made to this thing. I have a 3rd gen 29SF now.