I've done this, too, by accident... even though you can't arm 2 of the same item in your personal loadout, it will be used in fights... your top items are used, no matter whether they are in your personal loadout or not... it would be nice if the page would tell you whether or not you already own an item... I have so many items, it's a pain to try to check my inventory to see whether or not I already have one... but any "extra" items that you own are still being used in fights, so you aren't really losing out on anything... you can check this yourself by clicking on the details after winning or losing a fight to see which items are being used by both yourself and your opponent... 2 claymores should show up on the list (or maybe 1 in your personal loadout, and another 1 that your clan is using in fights)...
Last edited: Jul 12, 2012