Hey, the EXACT same thing happened to me. The round fired and the casing is left in the pipe but it tried to feed another round. I took my slide off to to check the extractor tension. It passed then test where you put a live round under the claw and shake so i thought it was somthing else. I got new mags, guide rods, different ammo. Nothing worked. I ended up getting an Aftec extractor. It fixed my problem for me. Works 100% now. It's frustrating when you buy a 1k gun and now have it work out of the box. If you do get the Aftec you will need to modify your firing pin stop. All the instructions are in the packaging. Best 100 bucks I've ever spent haha. Hope this helps and good luck.