Huh. I run all of mine like Waco, and I'm a southpaw. I don't like that sprue plate swinging around off the far end. I don't like it swinging back and burning the bejeezus out of the back of my left hand, either, (MP 4-bangers all seem to do this to me), so I've been known to put a long machine screw through the handle tong right behind the pivot bolt to act as a sprue plate stop.