These gun magnets are covered in a heavy duty semi soft plastic material so its not magnet on metal.
Secondly, it takes a LONG time and a lot of effort to magnetize a block of metal like a handgun. And as I said, the shock of shooting will rid it of any magnetization.
In order to magnetize a block of metal like a gun with a few draws, it would be strong enough to rip the fillings from your teeth... From a mile away.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.