colt diamondback rear sight replacement. - Pistolsmith

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Old 01-24-2015, 06:35 PM   #1
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Join Date: Jan 2015
Location: penns Grove New Jersey
Posts: 4
colt diamondback rear sight replacement.

i have a 4in colt diamondback in .22 LR that needs a new rear sight (accro).
the elevation screw broke and came out. It cannot be replaced because there is bar inside the sight that retains the elevation screw it also prohibits the screw from being able to be screwed back int place.

My question is : can I buy a rear site and replace the factory original. There is one hollow roll pin, very small diameter, that seems to hold the rear sight in place.

is it a straight forward replacement or is there going to be a hidden problem?
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Old 01-26-2015, 05:38 PM   #2
Senior Member
Join Date: Jun 2001
Posts: 1,800
The elevation screw is replaceable.

The "bar" inside the sight that retains the elevation screw is a removable pin.

Here's where to buy a new Accro elevation screw. Part Number 34.
See the schematic at the top of the page for how it all goes together.

DIAMONDBACK. Accessories | Numrich Gun Parts

The "bar" is part Number 31.

If you still have the original elevation screw remove the two TINY balls, part Number 32, and the tiny spring part Number 33.

Here's how to replace the assembly:

Remove the entire sight from the frame by using a 1/16th inch punch to gently tap the sight retaining roll pin part Number 38 out.
Drive the pin out from LEFT to right, being very careful not to scratch or scar the frame.

If the elevation screw is still in the sight, just unscrew it with a driver until the entire sight releases from the frame.

To remove the elevation screw if it's still in place, PUT THE ENTIRE SIGHT IN A PLASTIC BAG. This will prevent loosing the tiny parts, when/if they get away from you.

Push out the cross pin Part Number 35.

Push the elevation screw out of the sight body.
NOTE: Inside the elevation screw are two TINY balls and a tiny spring. Don't lose them. That's why you work with everything inside a large plastic bag.

To install or reinstall the elevation screw assembly:

First, coat the tiny spring and two balls with a thick grease to "glue" them in place inside the elevation screw.

Slip the elevation screw down into the hole in the sight base, tilting it to one side so one of the two tiny balls will fit into the sight, then press the other ball with a small screwdriver as you push the elevation screw all the way in.

IMMEDIATELY push the cross pin in place and IMMEDIATELY wrap a piece of tape around the sight and cross pin to prevent the pin from falling out.
The cross pin is usually so loose it will fall out, allowing the elevation screw to come out, loosing the two small balls and spring.

Only when you're ready to reinstall the sight on the frame, remove the tape.
Be very careful, the cross pin will fall out easily.

Put the sight on the frame and start the elevation screw into the threads in the frame until you're sure they are going in properly and not cross-threaded.

Once you're sure the threads are going in properly, press the front of the sight leaf down and reinstall the roll pin that retains it.
One help here is to make up a "slave pin" from some small pin stock.
Make a pin about as wide as the frame and an easy slip fit through the hole in the sight and the holes in the frame.

Put the sight on the frame and start the elevation screw, then slip the slave pin through the frame and sight.
When you gently tap in the roll pin the slave pin will be pushed out.
This helps prevent getting the roll pin out of line and causing it to damage the holes or the frame.

When the roll pin is almost all the way in, use a brass drift to fully seat it. This will prevent scaring up the finish on the frame.

If you need to replace the entire sight, the best option is to buy a brand new exact replica sold by Kensight.
They bought the company that made the sights for Colt.
If you buy a sight from Ebay or many parts houses, what you'll actually get is a Kensight, so you might as well buy direct.

Kensight Sights | Stop-By to Compare the Best Sight Reviews

If your sight has a white outline rear sight blade, you can change it over into the new Kensight easily.

To remove/install the actual sight blade, unscrew and remove the windage screw.
Hook the blade with a fingernail and pull it over to the left side of the sight body.
Tilt the right side of the blade up out of the base and lift the blade out.
Again, do this in a plastic bag.
Under the blade is another tiny spring.

Clean everything up and apply a thin coat of lube to everything.
Install the windage spring, then tilt the left side of the blade and slip the left side into the sight body, making sure the spring is fully to the left.
Pull the blade over to the left until you can push the blade down into the sight.

Replace the windage screw.

NOTE: The sight blade has a rounded and pointed lug on the right lower side. This engages the windage screw and gives the sight the "click" when the screw is turned.
The other lug on the blade is more squared off. DO NOT GET THE BLADE IN WITH THE WRONG LUG FACING THE WINDAGE SCREW.
If the blade is a white outline you can easily tell which side is which.
Old 01-28-2015, 10:23 AM   #3
Junior Member
Join Date: Jan 2015
Location: penns Grove New Jersey
Posts: 4
Diamondback rear view sight

Thanks a thousand times for the post and the excellent information. I can tell this is not your first day on the job. Thank you sir. I ordered a whole sight I think I will just replace the whole sight.

While the diamondback is not in new condition it is probably about 90% Im gonna shoot it. Not make it a safe queen, like the .38 that I have. It shoots pretty good. i broke the screw trying to lower the point of aim. Thanks again.

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