But wondering about the flat bottom FPS. Did it, alone, change the energetic ejection distance? If not, I wouldn't want it. A square edge striking against the hammer. The first thing it would likely do is score a line on the hammer face, a stress riser.
'Flat bottom' is a relative term. It's flat bottom compared to the standard stop, but there's still a lot of radius. The FPS was flat bottom as designed by John Browning until 1918. It was changed to make the pistol easier to cock either using the slide or by hand. It's a change I make to most 1911's I plan to fire a lot and usually allows me to use a lighter recoil spring.
