Sorry, I meant a bunch of different 2011 configurations. You had 5, 5.4, 6in barrels, bushing or bull, long, short, intermediate dust covers. Sight trackers, island barrels, poly grips, aluminum, and steel. Thumb rest or not, racker or not. I just don't see that mix in LO. I shot a TSO for a season, I really liked it but I wanted to tinker more, so I switched back to a 2011. I would bet everything settles out at a 4.6 slide full dustcover with a steel grip as being the most common setup.