Guns, Dogs and Blades QnA

Mine has dust in it, finer than anything I've seen. I sent it to my friend in the sandbox as a gift, when he was having problems with his Aimpoint. He brought it back for me [battle-used], and I gave him a new one.
That sand has a way of getting in everything, perhaps even empty whiskey bottles wrapped carefully in clothes and put in your sea bag to save as a momento? Which of course is then tossed out of the plane under a chute on a pallet with the rest of your luggage when you get home. Resulting in broken glass and sand in everything you own that was in said sea bag. Ah the brilliance of youth!