Howdy
I'm a little bit late to enter this conversation, but I will add my 2 cents anyway.
Back in the 1970s, most of the Remingtons being imported into this country had short front sights. My old EuroArms Remmie that I bought in 1975 did too. Didn't think much of it until I started thinking of getting a cartridge conversion cylinder fitted for it. At that time, I noticed that the old Remmie shot relatively high. So before buying the conversion cylinder I bought a new Uberti front sight, and had a local gunsmith fit it to my old Remmie. This particular Remmie had a dovetailed front sight. I didn't much care about if the sight was 'historically accurate' I wanted it to shoot well. The new front sight was taller, than the original, but it did not fit the original dovetail. No problem, the smith opened up the dovetail and mounted the new front sight, and that brought my point of impact down to where I wanted it.
Then I had the new cylinder fitted.
This is my old Remmie with its taller front sight and its conversion cylinder. Sorry, I don't have a photo of the old front sight, trust me, they were all shorter in those days.
A few years later I ran across a used stainless Uberti that included a conversion cylinder for a really good price. Yeah, the gun is stainless and the cylinder is blue, but I don't care, it was a really good price. Notice the Uberti front sight pretty much matches the new sight on the other gun regarding height.
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Regarding blue turning 'plum' color: When Ruger first started using their Investment Casting process, they were getting a lot of parts that were coming out plum color. It turned out the casting house was using silica in the alloy to help it flow better into the molds. Ruger had them reduce the silcon content in the alloy, and the plum problem went away. Probably not the only reason why blue can turn plum color, but it is one.
Here is a Three Screw 357 Mag Blackhawk from 1962 with a plum colored loading gate.
Plum colored loading gate on a Flat Top 44 Mag Blackhawk from 1958.