Retailer JoeBobOutfitters recently released their +4 magazine followers for the .22lr GSG 1911. They replace the factory followers and are made from injection molded glass filled nylon. At just under $8 (under $6 for their introductory sale price) they won’t break the bank. Check them out at JoeBobOutfitters.com.
I’ve purchased from JoeBobOutfitters.com a few times and they’re good to go, fast service and free shipping over $90.