I have to agree with Tracker. Never have had any problems with the many, many loaded guns I keep around.
However, there is one exception. Those POS factory Glock mag springs. After doing a mag check after laying rest for 1-2 years, 3 different Glocks had brokern mag springs. Boy was I pissed! The springs were in 2 pieces or even 3. I had these guns stationed in the house for personal defense.
They were a Glock 19, 29, and a 20.
And furthermore, the mags were not stressed, i.e., not maxed out. I ran them 2-3 short of full.
When I replaced the springs, you could tell the quality of steel was not "gun steel". They looked like springs from a bed mattress.
What a joke.