I recently bought a used springfield emp 9mm. The gun cycled every round I shot through it without a problem. I was however having issues with the pistol going into battery when loading a new mag. Luckily for me the gun shop I purchased from has great customer service and had their gunsmith look at it. It turns out the ejector needed to be tuned. The ejector was actually coming into contact with the round at the top of the magazine when it was inserted. this contact was causing extra friction and preventing the slide from going into battery. The ejector was also not allowing me to eject live rounds as they would get hung up in the gun. After I got the gun back from the gunsmith I shot 100 rounds of WWB 115gr and Remington UMC 115gr flawlessly as well as some speer gold dots.