I looked at the exact wording of the Wikipedia quote and am honestly not sure what the poster means. In any event it is incorrect. The M1854 Rifle-Musket in Austrian service was fitted with two different types of rear sights, but both had the exact same rifling pattern and twist rate. The "type I" Lorenz has a simple block type rear sight. In Austrian doctrine, this version would be the mainstay of the issued longarms for line infantry regiments. Though it seems like a point and shoot, Austrian manuals actually indicate different points of aim depending on the range, so that the block sight could be used in excess of 300 schritt. The "type II" has a leaf sight ranged to 900 schritt, and was issued to NCOs and the better shots in the third rank.
In American Civil War usage there are two other patterns of rear sight sometimes encountered, though both are quite rare. Some arms refitted in Belgium have an Enfield pattern rear sight added to them. They were also rebored to nominally .58 caliber. There are also a handful of commercially made Lorenz rifle-muskets with abnormally short rear sights more akin to what is seen on M1854 Extracorps Musketoons. In both cases, these features are not found on guns in their original Austrian service configurations.
I think the Wikipedia article may be confusing the whole M1854 family of arms and lumping them together with the "Lorenz" rifle-musket. There is indeed a short M1854 Extracorps Musketoon (short range), the standard M1854 Rifle-Musket (medium range) and the M1854 Jagerstutzen which, though shorter than the rifle-musket, has a much more sophisticated rear sight ranged out to 1,000 schritt (long range).
There is a lot of bad information on Austrian arms, and more than a few other types of Civil War imported arms, on the net. If you're interested in collecting stuff in that vein you'd be well served by picking up a copy of "European Arms in the Civil War" and/or "Firearms from Europe".
