[M1P90]

This is a step by step procedure on how to replace the tritium on the Black Ring Sight. This particular Sight had a broken tritium so there were lots of broken glass.

Use a heat gun to soften the rubber surrounding the tritium. Then use pliers or tweezers to pull loose the rubber. I started out using an exacto knife to cut out pieces of the rubber and to remove broken glass. I Accidentally put a small scratch on the upper part of the viewing plate. Luckily you don't see it under normal viewing. The Original Tritium looks like a FLAT 5mm x 10mm x 2mm thick or 6mm x 12mm x 2mm thick.

I looked around and the closest thing I could find was a ROUND 3mm x 11mm red tritium on e-bay.

Here is the exposed viewing plate. Notice how the black reticle is upside down. I guess it reflects off a mirror so it flips to your eye.
I also noticed that the black reticle circle wasn't exactly in the middle of the Ring sight. Don't know why that is.

A FLAT Tritium would have worked best and a lot easier to work with. Here is the ROUND tritium covering the T bar of the reticle.

I used a 100% waterproof silicone that stays semi flexible.

Continued ....

 

[vz58kid]

Is it easier to replace the Tritium on a White one?
Thanks

 

[M1P90]

Continued.....


I put a small amount of silicon to hold the tritium in place. After it dried I tested to see if the T bar glowed normally in the dark. YEP!
Then I tested a REM LED on it to see if it glowed correctly. YEP! Everything is working fine.

Be careful here. Since the tritium is round make sure you DO NOT push the silicone around and behind the tritium. It WILL block the light from getting to the T Bar.(It would have been better to use a CLEAR silicone instead of a white.) If you are just replacing the tritium lightly cover the rest of the tritium and area to seal it. I wanted to install the REM T3b to I left a little tritium exposed.

I installed the T3B and covered the rest of the area with black epoxy that cures hard. After it dried I turned on the REM on all 11 settings to see how the T bar glowed. perfect!

 

[M1P90]

I would think so. The white ring sight has a clear "rubber" holding the tritium. Just heat the rubber and pull it out. Buy the largest tritium that will fit in the slot and seal it in. Tritium is getting easier to buy and is starting to come in many sizes.

 

[Reathe]

this gives me other ideas...

Tritium Tube

 

[SAVAGEJIM]

Any way to take a pic or shoot a vid looking through your repaired sight?
i want to see how that red tritium turned out

 

[SONYtec]

I need to do this to my white ring sight some time. Good work M1P90!!!

 

[vz58kid]

Same here but my prob is I do like the white ghost ring on mine and also got the Rem T-3 for it which is fantastic, but I still want to replace tritium bar, but am concerned that if it breaks whatever then I have to spend a couple hundred to find a replacement sight & mount bar.

I have read a few reports where folks ended up destroying the sight beyond use, on another FN forum a Mod tells how he destroyed 2 White sights and gave up, I know one needs a sight tool to take it out and these range from$17.-$50.

I do wish I could find a Tutorial on how to do it however without that I am very worried, actually wish I could fins a old White ring sight cheap I know yrs ago they were selling for $100. or so but haven't seen any for sale in a while!

I did find a old Thread with pictures and tritium measurements but really no clear instructions on how to do it, will look for link!

Thanks

 

[vz58kid]

http://fnforum.net/forums/fn-ps90/33208-anyone-out-there-disassembled-ring-sight-print.html

There are a bunch of pic & Measurements for tritium bar at bottom but no real clear instructions on how to do it!

 

[M1P90]

Any way to take a pic or shoot a vid looking through your repaired sight?
i want to see how that red tritium turned out

Will do. I'll try and get some posted in the next couple days. I will turn on the REM on a few to show how it glows evenly.

 

[M1P90]

Same here but my prob is I do like the white ghost ring on mine and also got the Rem T-3 for it which is fantastic, but I still want to replace tritium bar, but am concerned that if it breaks whatever then I have to spend a couple hundred to find a replacement sight & mount bar.

I have read a few reports where folks ended up destroying the sight beyond use, on another FN forum a Mod tells how he destroyed 2 White sights and gave up, I know one needs a sight tool to take it out and these range from$17.-$50.

I do wish I could find a Tutorial on how to do it however without that I am very worried, actually wish I could fins a old White ring sight cheap I know yrs ago they were selling for $100. or so but haven't seen any for sale in a while!

I did find a old Thread with pictures and tritium measurements but really no clear instructions on how to do it, will look for link!

Thanks

All you need to do is remove the Ring Sight from the PS90 and then pry off the base plate. You have a clear shot at the Tritium and silicone. You need a heat gun to soften the silicone and slowly pry it out of the well. If you can find the FLAT 4mmx10mm tritium it would be easy to place it on the viewing plate covering the T bar. Then just fill the well with clear silicone and your good to go. All I could find that was close, was the 3mmx11mm ROUND tritium. I think it ran around $17 on ebay. It comes from the UK.

 

[SAVAGEJIM]

Will do. I'll try and get some posted in the next couple days. I will turn on the REM on a few to show how it glows evenly.

Thanks; I look forward to it.

When I bought my PS90, it only came with iron sights and the picatinny top rail with a built-in peep sight.

I do have a Burris FastFire III reflex sight on my rifle, so I am wondering how that mid-grade reflex sight would compare to the PS90 tritium sights

 

[vz58kid]

All you need to do is remove the Ring Sight from the PS90 and then pry off the base plate. You have a clear shot at the Tritium and silicone. You need a heat gun to soften the silicone and slowly pry it out of the well. If you can find the FLAT 4mmx10mm tritium it would be easy to place it on the viewing plate covering the T bar. Then just fill the well with clear silicone and your good to go. All I could find that was close, was the 3mmx11mm ROUND tritium. I think it ran around $17 on ebay. It comes from the UK.

https://www.etsy.com/listing/192218051/4x10mm-tritium-vials?ref=related-3 Guess this would fit? However the dude measured it in old thread at 3.8mmx10mm?

 

[M1P90]

https://www.etsy.com/listing/192218051/4x10mm-tritium-vials?ref=related-3 Guess this would fit? However the dude measured it in old thread at 3.8mmx10mm?

This place also carries the FLAT rectangular shape of 1.5x 3x6. https://www.etsy.com/listing/217015927/15x3x6mm-rectangular-green-tritium-vials?ref=related-5
NOW WE ARE GETTING SOMEWHERE!!! :th_4_17_2:

 

[vz58kid]

This place also carries the FLAT rectangular shape of 1.5x 3x6. https://www.etsy.com/listing/217015927/15x3x6mm-rectangular-green-tritium-vials?ref=related-5
NOW WE ARE GETTING SOMEWHERE!!! :th_4_17_2:

So what should I order for my White Ghost Ring? The dude who measured it showed 3.8mmx10mmm flat, am now totally unsure exactly what to order? I do want to replace it in mine later this yr!

So I guess I need a sight tool from e-bay but I also guess there is no way to keep sight set at ZERO once removed? Then I need to pry/cut base plate:th_confused0024: and then use heat gun to melt silicone and then PRAY!

Thanks

 

[M1P90]

So what should I order for my White Ghost Ring? The dude who measured it showed 3.8mmx10mmm flat, am now totally unsure exactly what to order? I do want to replace it in mine later this yr!

So I guess I need a sight tool from e-bay but I also guess there is no way to keep sight set at ZERO once removed? Then I need to pry/cut base plate:th_confused0024: and then use heat gun to melt silicone and then PRAY!

Thanks

You don't need a Sight tool to disassemble the Ring Sight. Just use a 3mm allen wrench to loosen the center hex nut then use a standard choke tube or even a putty knife to unscrew the adjustment screw. BEFOR YOU DO THIS... mark a line on the adjustment screw and on the Ring sight to help you re-align the ring sight to zero. The base plat is held on by 4 tabs. just unlock the tabs with a small screwdriver and the plate will pop off.
As for the Tritium. You might get the flat 1.5x3x6 green tritium. (it only comes in green). Place it right on the T-bar and cover it with clear silicone.

 

[vz58kid]

Thank You a Million! But why the 1.5x3x6 flat tritium and not the 3.8mmx10mm flat ? I thought the size in it is 3.8mmx10mm? Which is more powerful (bright?)

Thanks

 

[M1P90]

The original tritium on the sight was measured 1.5x3.8x10mm. If you can find one anywhere let me know. The closest thing I could find was the 1.5x3x6mm in green. There are round ones for sale that measure 4x10. You can buy any size you want as long as it covers the T bar hole on the sight.

 

[vz58kid]

If I get the1.5x3x6 green tritium how would that affect my Rem T-3 in red? Also if I would take 2 vials and put them on top of each other or side by side would that make the Glow 2 X as bright?

What is the largest (and therefore the brightest?) size I can put in there?

Thank You!

 

[M1P90]

If I get the1.5x3x6 green tritium how would that affect my Rem T-3 in red? Also if I would take 2 vials and put them on top of each other or side by side would that make the Glow 2 X as bright?

What is the largest (and therefore the brightest?) size I can put in there?

Thank You!

The color of the LED is the color of the T bar sight picture. The original tritium is red however if you use a green LED the T bar is illuminated green. The same with a blue LED. If the tritium is GREEN and you use a RED LED the tritium will be illuminated RED.
I'm not sure 2 vials on top of each other will glow brighter. You can buy 2 and try them out.:icon_think: But I doubt it will be brighter.
Plus there is not a lot of room in the ring sight to stack them.