Just wanted to share a little knowledge that I recently learned with you guys.
If you have a Glock (or any polymer frame handgun) and you’re having issues with your empty mags not falling free, one solution that worked for me was to heat my frame up with a hair dryer and insert a magazine wrapped with 2-3 layers of masking tape. Let it sit for roughly 20 minutes, then drop the mag and masking tape. Make sure to leave the magazine locking notches uncovered so the magazine still locks in.
Here I’m using a regular glock magazine, no weighted baseplates or anything like that.