|
The main issue is whether the manufacturer used a good quality spring steel or not. Decent springs won't take a set from compression, they only wear out from being cycled. People have found real mags from World War One fully loaded and the spring still fed perfectly some eighty years later. However I definitely have seen springs in airsoft mags not perform correctly which lends credence to the belief the spring material used is inferior.
I would trust TM mags to stay loaded for a good deal of time. Other manufacturers whose main interest is low price I wouldn't be so sure about. Regardless, leaving your mag loaded for a few days or even a few weeks (heck, probably even a few months) is not going to hurt it.
|