Breaking guns for Gp?

I have been told by many players that you can break your weapons and get a gp refund. I was wondering if I could break my m700 (don't need it anymore because I got draggy :P) and my m16, and if I could, how much could I get from them? I have broken an Mp5 that I got out of a crate and I didn't get a refund, so does it only work with weapons you buy?

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