Looking at the 1995, 1997, 2002 and 2005 Dixie Catalog, they show the Uberti 1862 Police with a 5 1/2 inch barrel.
I don't know if this is just because Dixie only ordered that length barrel or not but I am sitting here typing with a 1862 Uberti Police Colt pistol in my lap. It has a 6 1/2 inch barrel on it.
I should mention that it was made in 1977 but if they made the gun once in that length, they may still make it. I guess you'll have to wait for it.
This is a 5 shot .36, with fluted cylinder and it weighs exactly 26 ounces.
As you know, this is a very scaled down 1860 style Colt, the only thing similar being the trigger guard and the distance from the front of the grip to the trigger.
Speaking of the grip, it is a full 1/2 inch shorter than the 1860 Colt grip and if your hand is like mine, you will find that you will have to hold the gun with one finger on the trigger, two fingers on the grip and the little finger folded under it.
Mine is a beautifully made gun, and personally, I think the 1862 police was the most attractive of all of the Colt pistols.
I've found that shooting it with 16 grains of FFFg under a .375 ball is a lot of fun except for one thing.
Because it is so light weight it is very hard to hold it steady enough to get a good group despite the excellent trigger pull.
I'm sure you won't like it so just PM me for my mailing address. (You can never have too many, Ah sais).