I would buy Wilson Combat magazines. They have a no tilt folllower and the mag body is SS. They are the gold standard of mags for the 1911 these days. Just get magazines that are made for the 1911 government model for your gold cup.
There are fake colt mags out there. If you read up on them you can spot them.The cheapest consistently reliable magazine in my experience is the Checkmate 7 round "hybrid" mag. They're around $20 and are basically an updated Colt 7 round design with feed lips that work well with a wide variety of bullet shapes. They don't look cool or tactical or whatever, but they work well.
I have had issues in 2 of my 1911s with the Shooting Star mags as well, they now sit in the safe unused.I must have gotten the lemons from Chip McCormick. I bought three of his Shooting Star mags several years ago, and they turned my will-feed-anything 1911 into a jam-o-matic. I replaced the Shooting Star followers with Wilson followers, and they run perfectly. Now all I buy are Wilson mags.