I tried this with a glock, and near as I can tell it does not work, I think the mosin and double barrel (possibly the izh12 and blaze as they run with the same theme of weapon) may be the only ones it works with, I will need to test it more, but I would highly recommend you removing these guns until the problem is solved, the double barrel specifically would be devastating if it remains in the game.
PS: I'm making this private because its very easy to reproduce and very dangerous, also near as I can tell no one knows about it yet, and I would like to keep it that way.