I've seen countless videos depicting firearms working just fine using magazines that have been fully loaded for 2, 5, even 10+ years, and the guns always work just fine, even seen two videos showing that the spring has very slightly shrunk but it still functions with no problems. I've never once see a video showing a firearm malfunctioning due to long term magazine spring compression. Why do so many people say keeping mags fully loaded is bad but never show any real proof that it does harm to the function of the mags?