The difference is in what they get used for. For target shooting, basement plinking, hell, even running around your house like a yahoo with a couple of friends, Wal-Mart springers do the job perfectly. However, for the majority of actual games, Wal_Mart springers tend to be underpowered, slow, and relatively unreliable. I mean, it's wal mart. So they aren't exactly top quality. However, if that's what you like using them for, they will suit your needs perfectly. And a word to the wise, I wouldn't rock the boat with members here as to how they got their guns, as you might start a big flame spewing shite fest the likes of which you've never seen.
I'm just saying.