I've seen a few magazines that leak after some time being left completely full, but very few. Most magazines are stored full, or with a lot of gas in them. I haven't seen a magazine that I would suggest to leave empty. If your not sure, fill your mags with gas and silicone oil and let a couple shots off. By fill I mean completely full of gas with just two, to three drops of oil; and by shots I mean five or six.
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BC & YUKON MASTER AV REPRESENTITIVE