Yes, the Colt Lightning is a very good looking gun. I have one of those too.
I can't shoot 41 Magnum in my Colt?
.41 Mag should be too big for the Lightning's cylinder, if you do somehow get it to fit, you'll have over pressure issues. Likewise, .41 (long) Colt is a smaller round, if you should find a .41 Colt, it will probably fit case wise, but won't shoot well, because it's a smaller bullet.
.41 Mag is actually a .41 bullet, .41 Colt is closer to a .40 round.