Rear Sight Hole Spacing

[fc60]

Greetings,

I have what appears to be a K-frame rear sight assembly.

The odd part is the distance from the elevation screw hole to the mounting hole is about 1.760". Much shorter than the sights on my M-67 and M-14.

It certainly does not match up with any of my N-frame pistols.

Is there a chart showing the various hole patterns and models used on?

Cheers,

Dave

 

[Tired Gunsmith]

There were more than one configurations on the sight screw location.
Never remembered when the reference to which guns had the change instituted.
Must have been a change order issued, but no longer have my old books.

 

[2152hq]

It's for a pre-14, pre-17,,ect.

The hole spacing changed when they went to the Model w/number system I believe (1957..?).

Similar change in the N frame revolvers,,a different hole spacing from the 'pre-model' guns to the Model# guns.
But the K and the N spacings are different from each other of course.
(IIRC the N frame guns attachment screw are approx .010 farther 'out' than the K frame)

A pre-14 in my hand (1954 mfg) measures right about 1.750 betw the centers of the adj screw and the attachment screw when checked with my MickyD Pro-Gunsmith Dial Caliper and Can Opener Survival Tool.

 

[Alk8944]

It's for a pre-14, pre-17,,ect.

The hole spacing changed when they went to the Model w/number system I believe (1957..?).

Similar change in the N frame revolvers,,a different hole spacing from the 'pre-model' guns to the Model# guns.
But the K and the N spacings are different from each other of course.
(IIRC the N frame guns attachment screw are approx .010 farther 'out' than the K frame)

A pre-14 in my hand (1954 mfg) measures right about 1.750 betw the centers of the adj screw and the attachment screw when checked with my MickyD Pro-Gunsmith Dial Caliper and Can Opener Survival Tool.

Unfortunately this information is incorrect.

Per SCSW4, Model 14, page211; "Engineering and production changes; 14-3 1967, Relocation of the rear sight leaf screw" This follows through all K-T Frame -3 changes for all models.

I had to look it up because I didn't recall the dash change. I did know it was after my 14-1 however.

 

[Hondo44]

From what I've read the change was to move the attachment hole off of, forward of the barrel/cyl gap.

 

[2152hq]

Sorry, looks like I goofed up on when it came to be.
Thought they were changed at the model name/model # switch.

Open the cylinder and look under the top strap. If you can plainly see the attachment screw hole, it's the short hole spacing.
If not , it's forward up under the bbl shank,,it's the longer hole spacing.

 

[Bushytale]

The shorter/early spacing was changed with the -3 on all the K-frame adjustable sight models. So models 14,15,16,17,18,and 19 -2 and earlier will use the shorter spacing.