Standard White Ring Sight and USG Black Ring Sight

tqtran · Last edited by tqtran on Tue May 12, 2009 10:11 am; edited 1 time in total

Now I know some of you on here are worried about the height of your sights so I thought I would share some pictures I took today.
I didn't have a ruler with me but guessing, I would say that the USSS ring sight is about 5mm shorter than the Factory White Ring Sight.

For a dimensional Comparision of the two ring sights, the USSS black ring sight is smaller than the white ring sight.

White Ring Sight on Left and USSS RBlack Ring Sight on Right. Note the USSS right sight is smaller in height.

Sorry for the poor pictures, I had some bad lighting problems.

ShipWreck · Posted: Mon Feb 12, 2007 7:47 pm Post subject:

Thanks for the pics. Interesting....

Just from prev photos, I knew the shape was at least a little different.

metroplex · Posted: Tue Feb 13, 2007 8:35 am Post subject:

The USG sight does look a little shorter. FN should have started selling the PS90s with the USG sight rather than hand out the inferior MC-10-80.

ShipWreck · Posted: Tue Feb 13, 2007 8:39 am Post subject:

They are now, but they charge more for that version.

M1P90 · Posted: Sat Sep 29, 2007 12:42 pm Post subject:

I know this gets confusing because its different all over the internet but according to Ring Sight.

From Ring Sights:
HC-14-62 - White Reticle Ring Sight with plastic housing.
MC-10-80 - Black Reticle Ring Sight with metal housing.
Wiki has it listed the other way around. Personally I am a bit confused myself. Maybe someone can ask FN in the next Q&A for a difinative answer.

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RING SIGHT HC-14-62
FN chose our HC type with a circular aperture of 14mm diameter for their P90 sight. The HC design has a dual reticle - rings and a dot for day, open T for night. The open T doesnot obscure the target which may be difficult to discern if the reticle overlays it.Its height is greater, for a given aperture, than the LC type but this can easily be fitted intothe space between the barrel axis and the sight line. On the P90 the optic housing is plastic and the interface of the housing with the gun is by two zeroing screws.The optic can be put into other housings such as one with a laser pointer beneath it,complete with the laser battery, on a zeroing mount with range settings, the whole on adovetail interface for the British 5.56mm rifle.

RING SIGHT MC-10-80
The MC-10-80 is specifically designed for the FN Herstal P90. The sight is a unit power telescopic sight with a black graticule for day use and a open T for night use lit by a red tritium light source. Being NVG compatible it is ideally suited to 24 hour operations.

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Here is the info direct from Ring Sight:
http://64.233.167.104/search?q=cache:XXlQxOQ_uqAJ:www.ringsights.com/Tech%2520Papers/13733.PDF+HC-14-62&hl=en&ct=clnk&cd=5&gl=us

http://www.ringsights.com

Here is a sight picture of the White Ring Sight (using the front light collector to illuminate the "Dohnut")

This one shows the (rear light collector) "T-bar" lit up with a flashlight.

This is the sight picture of the USSS/USG Black Reticle Sight.

This is the front light collector of the White Ring Sight.

This is the rear light collector of the White Ring Sight (A). notice the white tritium bar at the bottom of the well (B).

This is the bottom view of the White Ring Sight. You can see the white tritium bar imbedded in the clear gel caseing.

This is the Black Ring Sight (taken from the FNH homepage)

Here is a great web site that has lots of info on the PS90.
Overview (size, weight etc.)
Mechanical Characteristics
internal and external parts descriptions
ballistics charts
http://en.wikipedia.org/wiki/FN_PS90 Awesome

Click on this link to get a detailed description of how the white ring sight works. It even has a visual.

http://www.remtek.com/arms/fn/p90/sights/index.htm

Check this link out. It also has info on the 2 Ring Sights.

http://www.ringsights.com/Products/sights/SightsDesc/MC-10-80.htm

Thumbs Up

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M1P90 · Posted: Fri Oct 05, 2007 10:57 am Post subject:

It would be GREATLY appreciated if someone with a Black Ring Sight could post some pictures here. Thumbs Up

Lets add on to this sticky! Awesome

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metroplex · Posted: Fri Oct 05, 2007 11:13 am Post subject:

The tritium isn't replaceable because Ring Sights won't replace anything, heck they won't even respond to emails.

tqtran · Posted: Sat Oct 06, 2007 7:03 pm Post subject:

tqtran · Posted: Thu Oct 11, 2007 1:39 pm Post subject:

OK, here you go.
These are the best pictures I could take and it took me many tries to get these.

USSS Sight Front View

USSS Sight Top View

USSS Sight In Complete Darkenss

USSS Sight in Natural Day Light

M1P90 · Posted: Thu Oct 11, 2007 3:26 pm Post subject:

Those look great tqtran. Thanks for the pics.

oh .. buy the way. could you get a pic of the rear sight optic area so we can compare it with the White Ring Sight rear light collecting area.

Thanks again for your help.
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tqtran · Posted: Thu Oct 11, 2007 6:27 pm Post subject:

brazos609 · LEO Joined: 05 Jun 2007 Posts: 42 Karma: Location: CS, TX

The USG sight is not only dimensionally lower on the receiver, the offset design makes the line of sight lower(closer to the barrel) than anything else possble. The front lense(objective) is actually lower than the rear mounting surface. Even though you are looking through the eyepiece above the rear mounting surface, the line of sight(height over bore) is actually below that point. Not having measured a USG equped model, I would estimate it has a height over bore of about 3". lower than any other possible sight.

tqtran · Posted: Fri Nov 16, 2007 7:50 pm Post subject:

USSS Sight Bottom View

Adosh · Posted: Sat May 31, 2008 2:13 pm Post subject:

i went to a gunshow today and i handled both a blackring p90 and a whitering p90

man that black one is alot easier to see Thumbs Up

_________________

M1P90 · Posted: Sun Jun 01, 2008 5:45 am Post subject:

CriticalDimensions · Likes FNF Joined: 13 Feb 2007 Posts: 458 Karma:

Send me a T3 and I'll give you my best unbiased opinion Very Happy

I'd be glad to post a comparison between the black reticle & White w/REM ring sights as I now have several of each mounted in various applications including firearms other than the PS90.

I've got both a USSS Black Reticle & a White Ring w/REM2 that I've been using for development & testing. Lots of range time with both. Prior to the REM2 installation I had a preference in using the black reticle and would even switch it out between PS90s which led me to buy another two black reticles. After I installed the REM2 on the white ring I have been using the white ring w/REM a little more than the black reticle. But, Maybe that has something to do with a new rail mount for the Ring Sight....
The REM really works great, without it I wouldn't use the white ring sight at all.
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M1P90 · Posted: Sun Jun 01, 2008 6:09 pm Post subject:

I'll send you one of my prototypes for you to use. Looking forward to seeing the viewing and price comparison. I'm also looking forward to testing your rail. can't wait to try it out. I Give UP

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uscbchuck · NooB Joined: 01 Jun 2008 Posts: 10 Karma:

hey, which way do u turn the sight adjustment screws to change point of impact? ie spin right to move left etc...
thanks

Tomac · Posted: Sun Jun 22, 2008 3:19 pm Post subject:

Lone Yankee · Posted: Mon Feb 02, 2009 7:57 am Post subject:

I had a change to heft a PS90 with this sight last week and it is 100% better than the stock ghost ring. It is well worth the $ IMHO.

-LY
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M1P90 · Posted: Wed Apr 08, 2009 8:28 am Post subject:

Here is how to adjust the Ring Sights.

How to Align the Sights on the FN PS90 Rifle Using the FN Sight Tool
Using the FN sight tool to align the sights on the FN PS90 rifle.

StepsSlide the allen wrench supplies through the sight tool with the short 90 degree section sticking out the top of the widened part of the spanner tool.

Carefully insert the allen wrench into the allen locking screw for the screw controlling the adjustment direction needed. This will be the vertical screw closest to the shooter for vertical adjustments, and the horizontal screw inside the sight riser for horizontal adjustments.

Once the allen wrench is securely seated into the allen locking screw, gently loosen the locking screw.

Turn the spanner tool to adjust the sight alignment of the ring sight.

Clockwise movement of the spanner tool will result in moving the bullet strike up and to the left depending on which adjusting screw is being turned. Counterclockwise rotation will result in the bullet strike moving downward, or to the right accordingly.

These adjustments are fairly coarse, so small movements are recommended.

Tighten the locking screw, and test fire the weapon to verify alignment. Repeat these steps as necessary to zero the firearm.

The adjustments on the Factory Ring Sight are fairly coarse, so use small corrections, test fire and repeat as necessary to zero the firearm
Note: The "adjustment tool" is an absolute waste of $60 or so hard-earned dollars. A 3mm metric allen, in conjunction with a standard choke tube wrench work perfectly fine using the above directions.

Warnings As always when working on any firearm, always keep the muzzle pointed in a safe direction. Never assume that the weapon is unloaded. Verify by removing the magazine, and checking the chamber area that the firearm is unloaded, and again always keep the muzzle pointed in a safe direction.

Things You'll NeedFN PS90 sight tool, or similar manufacture.

http://www.wikihow.com/Align-the-Sights-on-the-FN-PS90-Rifle-Using-the-FN-Sight-Tool
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Hawk · Bullseye Shooter Joined: 19 Mar 2009 Posts: 165 Karma:

Just shot my ps90 and its about 2.5 in high and 2 in right at 50 yards I dont have sight tool. Can I just loosen allen screw and then turn big slot head then re tighten allen screw?

M1P90 · Posted: Wed Apr 15, 2009 7:07 pm Post subject:

Yes. Just use an allen tool and a wide flat screwdriver or even a coin.
Sight tools are easier to use but anything will do. Thumbs Up

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