"If it floats your boat."
At the range a while ago I was all alone with my Eagle in .41- and .44-mag. Just getting the feel of the set (report, later) when another fellow came in to my right. I had taken the farthest left, just, as in this case, someone else arrived and needed the room. We exchange hi-signs and kept to ourselves. He was practicing draws from various positions, and had a Glock, easily identifiable by its "Perfection In Ugliness." Each time he drew and pulled, I noticed something fly out in my direction, hitting the concrete about 2-ft from his stand. He'd retrieve it and draw again. After 6 or 8 draws with this happening each time, I waved at him and took off my muffs. "Is something falling off of your Glock, or what!?" He came over with the Glock, and the "thingie" in his hand, and explained: it was a milk-jug bottle-cap he had whittled into a perfect trigger-blocking "thingie" at his girl-friend's request, to completely jam the trigger from firing. As he drew, the piece popped right out with just minimal trigger-finger pressure ... not a microsecond of time wasted in flipping up anything like a manual safety. He said he was working on a patent. If I hadn't seen how he did it, I might buy one, but it's so easy to whittle up my own, so .... Dao.