HD-020-U Snake Sight Rear Sight Blade

U-Notch Rear Sight Blade
$39.95

This item is the blade for the rear sight assembly supplied by Colt, not a complete sight assembly.

The HD Snake Sight rear notch dimensions have been enlarged to give the sight picture more prominent light bars on each side of the front sight. Changes to increase the notch size allow more daylight into the sight picture, letting the eye more quickly acquire and better focus on the front sight.

The dovetail has been widened to allow fitting to the sight body, to eliminate the factory sight blade's wiggle, so fairly simple fitting is likely necessary. Please read the installation instructions to decide if this job is in your skill set and you have the tools needed to be successful. 

The blade height has been increased by .040” which allows a deeper notch by a like amount to give taller light bars.

The notch width has been changed from .130” to .150” to allow more daylight into the sight picture.

The top outside corners have been shaped in a large radius to minimize snagging on garments or cutting hands or holsters.

The blade’s thickness has been increased to improve the crispness of the sight picture and the radius at the bottom of the blade has been enlarged to strengthen the blade.

The dovetail size has been slightly increased to reduce the slop that existed with the original parts.

The set screw has stayed the same size, 4-40" x 1/8" with a .050” hex drive, so it's hex key also works with the front sight. The set screw’s placement has been moved to the center of the of the blade.

NOTE: LocTite 242 (blue) should be applied to the set screw with the tip of a toothpick to prevent loosening, once windage is adjusted. If you do not have any, you can add it to your order here - LocTite 242

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Existing reviews

U groove rear snake sight
5
This review is on the HD-020-U rear sight blade.  
Shipping was very fast and packaging was excellent.
Product quality is outstanding.  This is exactly what “should” have been stock on a firearm of this stature.  It looks right and is very robust in comparison to the stock rear sight blade.
Fitting for my specific gun was very easy and took about 45 minutes.  I used 600 grit paper to bevel the edges as clearly described in the fitting instructions.  I had to remove a touch under .002” along the dovetail front and this is what took the bulk of the time.  A few swipes, test, swipes, test until it slide easily through the channel.  I then soaked the sight in acetone, dried it and cold blued where bare metal from sanding and filing were present.  
Assembly, again, was as described in the instructions.  A light coat of oil applied for final fit followed by a dry cloth wipe down and I’m back in business.
If you’re on the fence between this option or a major competitor’s version but don’t want their name stamped right on the top of your Colt rear sight, go with this option.  The opened up radius is incredible for super fast sight acquisition especially with your choice of front sights.
A+.
rjackson@shermco.com | 3/30/2023 3:23 PM
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