Don't You Just Wish.....

[Harley Starr]

There should be a reproduction of a rare 1860 Colt with the Navy grip frame and have a 7 1/2 inch barrel resembling the 61' Navy.

[Major 2]

Sorry, can't say do wish it...
if I wanted such a varriant, it's a simple 6 screw swap.
All one needs is the donor 1860 and the Grip, backstrap, spring & TG from VTI or a donor ( same manufacture would be best ) 1851 or London model.
From time to time someone, is advertising to swap Grip assemblies ( there is or was one in the Classifieds recently ) you might find your way there. 

I've seen a photo of a rare early production prototype 1860 with 51 Grips ...there may be others that were changed , perhaps by Smiths in the era.

Course I for one,  prefur the 1860 , and the 51 as Colt intended them. 

However, Pietta is putting 60 Grip frames on some of their 1873's NIB  as a novelity model....

[Mako]

There should be a reproduction of a rare 1860 Colt with the Navy grip frame and have a 7 1/2 inch barrel resembling the 61' Navy.

Ubertis?
If so how many pairs do you want to swap?  I'm talking grip assemblies now.
~Mako

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[Flint]

Early and prototype Colt 1860's had Navy grips, 7-1/2 inch barrels and some had fluted cylinders.  The Army Ordnance Dept. after testing, specified the 44 caliber to have an 8 inch barrel, so Colt made them that way in production.

Though Uberti and the 2nd and 3rd gen Colts made Fluted Armies, they never made the 7-1/2 inch barrel or offered Navy sized grips, that I know of. 

Most original Colt Fluted Armies had a 7-1/2 inch barrel, by the way, and were cut for a shoulder stock.  The 7-1/2 inch barrels were right hand rifled, the 8 inch barrels were left hand progressive rifled.  Only early, probably pre-production 1860's had Navy grips, unless special orders were made, and no doubt were, as it was an option.

Such a gun could be made by the owner, as mentioned by Major 2, with a gripframe swap.  The London Navy and the 1861 Navy have steel gripframes, as do most of the Uberti made SAA revolvers.  The barrel length can be made with a cut and a remounted front sight.  A more expensive way would be to rebore and rifle an Uberti 1861 barrel.

To be authentic, the triggerguard should be brass and the backstrap steel.  Although Uberti's "Civilian" model 1860 has all brass gripframes, the original had iron backstraps, even on the model without shoulderstock provision.

Parts can be found from folks on this or similar forums who have swapped out parts, as well as VTIgunparts.com.