This is a discussion on Question on mag break-in and long term storage (glock mags) within the General Firearm Discussion forums, part of the Related Topics category; Originally Posted by sojourner They are all OEM glock normal capacity mags (sorry about the verbiage, but I don't like to call them hi-cap. Normal ...
As long as the Mag springs are of good quality from the factory yes..
there have been more than a few reports of people finding mags that grandpa had with his 1911 from world war II loaded since then and the ammo and mags working just fine after all that time..
Now if its a junk spring then well all bets are off
i'm assuming oem glock mags are quality