Indeed you can.
I bought a bunch of AR-15 mags that were used in desert storm, mil surplus. I figured they'd work good and all since they were issued. Boy was I wrong. I had to replace every spring in every mag. Now they work alright... I like my "non-issued" mags better as they were brand new when I bought them and work flawlessly every time.
I'm a little concerned about my shotguns however. You think loading three into the pipe and keeping them like that is a bad idea? The tube capacity is 8, so I figure 3 wont wear out the spring too much.