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For a shrouded Cobra, I'd recommend contacting the Colt Custom Shop.
Back in the 1990's Colt made up a couple of short run, limited production Detective Specials with a night sight in the front.
These were installed by machining a hole in the front sight level with the top of the frame.
The extreme angle of the hole of the ramped sight required actually machining the hole.
I'd ask if they're still set up to do that.
The second option is used on revolvers with non-replaceable front sights.
In this method a dovetail is machined in th sight, and a small block with a night sight insert is installed in the dovetail.
This works well, but looks odd because of the lump-like appearance of the block in the ramped sight.
For this type, I'd contact the sight makers and ask who they recommend to do the job.
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