Description
That old brass bead sight on your Colt gets the job done, but it can wash out in shadows and give tired eyes fits. This green fiber optic front sight from Marble Arms fixes that in a hurry. The green rod pulls in ambient light and glows bright, giving you a clear aiming point that's easy to pick up fast whether you're punching paper or ringing steel. Folks who've made the switch consistently say the green dot shows up far better than the original brass bead, and getting on target becomes second nature.
What the Marble Arms Green Sight Fits
This one is cut to drop into Colt Cobra and Python revolvers, and it plays nicely with the King Cobra and King Cobra Carry family too. It measures .140 inches tall and .125 inches wide, which matters when you're matching a replacement to your barrel. It works great as a direct swap for a damaged front sight or just as a straight upgrade over a plain factory blade that isn't cutting it anymore.
Installing the Cobra/Python Fiber Optic Sight
Installation is a straightforward DIY job for most people. The front sight is held in place by a small set screw that takes a .050 inch (1.27mm) hex wrench, and once it's backed out the sight lifts right up. A word to the wise: that little screw is easy to strip if you crank on it, so use a quality hex tool and a dab of medium-strength thread locker so it stays put under recoil without going overboard.
Getting Your Green Dot Dialed In
Since the fiber optic blade can sit at a slightly different height than your factory ramp, you may need to tweak your rear sight elevation to bring point of impact back to point of aim. Range reports back this up, with owners hitting steel out past 40 yards from short-barreled snubbies once things are lined up. Give it a few rounds to confirm zero and you'll have a bright, dependable sight picture you can trust in most any light.
Key Specifications
- Manufacturer: Marble Arms
- Manufacturer Part Number: 900008
- UPC: 871373006315
- Model: Python
- Style: Fiber Optic
- Color: Green
- Height: .140 in
- Width: .125 in
- Fits: Colt Cobra / Python
- Sight Type: Front Sight
- Install Tool: .050 in (1.27mm) hex wrench
What’s Included
- Green fiber optic front sight
Frequently Asked Questions
What revolvers does this Cobra/Python fiber optic front sight fit?
It's designed for Colt Cobra and Python revolvers and also fits the King Cobra and King Cobra Carry. It measures .140 inches tall and .125 inches wide. If you're unsure about your specific model, measure your existing front sight before ordering to confirm the match.
What tool do I need to install the Marble Arms front sight?
You'll need a .050 inch (1.27mm) hex wrench to back out the front sight set screw, then the old sight lifts right out and the new one drops in. Use a quality hex tool because that little screw is easy to strip if you overtighten it. A dab of medium-strength thread locker will keep the screw from backing out under recoil.
Will I need to re-zero my revolver after swapping to this fiber optic sight?
It's a good idea to check your zero after installation, since the fiber optic blade can sit at a slightly different height than your factory sight. That may shift your point of impact, so you may need to adjust rear sight elevation to bring things back to point of aim. Fire a few groups at the range to confirm everything lines up before relying on it.
Is the green fiber optic easier to see than the factory brass bead?
Yes, that's the whole point of the upgrade. The green rod gathers light and glows bright, so it pops into your line of sight much faster than a plain brass bead. Owners with aging eyes especially notice the difference in target acquisition and low-light visibility.





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