Hi guys, new to the forum and new to gun ownership period. I recently purchased my first pistol, Springfield 1911 GI. It might not be the best "first" pistol to buy but the history and reliability behind the Model 1911 was the most appealing part. I purchased the gun used with very little wear, it looked to be hardly shot plus I purchased it for a great price. After my first time shooting it, it began to have a hard time extracting the empty cartridges (started chimney stacking). When manually pulling the slide back it extracts perfectly fine, I went home disassembled the upper to clean the barrel, slide etc. My first thought was that I was using bad ammo (repacked ammo from the range), my second thought was that the clips I was using (one Springfield blue 7rd and one Kimber 7rd) were garbage. Do you guys have any other suggestions on how I can trouble shoot this problem. Im a new owner but have slight knowledge on firearms. Any help is much appreciated.