From The Manufacturer/Wikipedia/People Smarter Than Us:
The Lightning Rifle is an exact replica of the original Colt Lightning introduced in 1884. The Uberti model safely stands up to modern ammunition because it’s made with modern steel and today’s manufacturing techniques. The Lightning Rifle is available in .45 Colt or .357 Magnum. It has luster-finished satin walnut stocks and color case-hardened receivers.