Just wanted to confirm that this does work, and works on kino and five, me and my friends do this from time to time. Simply buy claymores and place them wherever you want (we usually load up the little corner by the bowie knife with claymores each round on kino). If you ever go down and respawn the next round, run over to one of your claymores and pick it up. You can use it instantly, hold it, or whatever else you want to do with it.
Each round (or every max ammo) you will get 2 claymores again without paying another 1,000 points to buy them off the wall. I'd call this more of a trick than a glitch, useful if you suck and die a lot, other than that pretty much pointless.
+rep for posting for those who didn't know