Yesterday it happened TWICE to me, that i have thrown away my fully geared AKM and MOSIN while aiming through the scope so far that even an olympic champion would be envy.
Problem is that you throw your weapon even while you are aiming through the scope (where you want to shoot an enemy not throwing him dead by your weapon).
Maybe most users dont have the problem because they have "hold breath" by standard on right mouse button but i have it on button H which is right besides of G (the throw button).

Well just aim through the scope by one-click right mouse and hit G
you know what i mean. the weapon flies far away from you and in a forest/meadow
you wont find it until the server restart...