If you have magazines that have an open front that allows you to visually check their position then make note of it before your load and make ready. Otherwise Boneyman's suggestion really is the best alternative and keeps it fairly similiar to a press check with a real pistol. Another thing you could do that's slightly more involved is get yourself a darker colour bb in the same weight. Place the dark bb last in the magazine (at the top), load-ready and eject the mag. If it's not at the top of the feed lips then it's likely chambered.
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