You need to adjust the lips of the magazine until it feeds without jamming.
Use smooth jaw pliers and open the lips slightly, try cycling rounds through it and open more if needed. Bend both sides out a very small and equal amount at a time until it stops jamming.
Wipe the oil out of the magazine, it collects dirt and dust and will cause more problems. If any lubrication is ever needed in a magazine use a dry lube.
Let me know how you make out,