Promag glock 48/43x 15 round magazine - ProMag Steel Glock 48/43X 9mm 15-Round Pistol Magazine

At first the magazine appears well made and definitely was looking forward to the 15 round capacity. However immediately had multiple feeding issues with critical defense rounds. Then seitched to normal FMJ. Ran 4 full magazines theough G48. not a single one shot all rounds without jamming. Then switched to my G43x. Same issue. Brought magazine home and took apart to clean it. Spring and follower seem flimsy. Cleaned magazine and parts and reassembled. Will try again this weekend but am not confident enough to keep in my carry weapon as primary magazine.