From handling/dropping or from regular use in the firearm?
Regular use. I have 4 firearms that accept the B&T 9mm mags so they all get constant abuse.
I just got an email that the bumpers are back in stock from another dealer. They help protect the base from damage from dropping. The feed lips are definitely the weak point on the mags. I would buy a stack of the KCI mags if they came in. They would be roughly the same price I suspect.






















































