Mags, US Army....
When I was a active duty US Army MP in the 1990s, my M9 pistol mags would pop out often. When I turned or sat in a vehicle, it took place. It wasn't a big problem but I'd tap the magazine base often to insure it was properly seated.
Patrol work & security details will knock any weapon around. It's just how it goes. A co-worker & federal 083 police officer once told me of a PD's office that had scuffs & nicks in all the door frames from cops walking thru for decades.