Just got a new PS 90, I'm leaning toward a Trijicon MRO, but what are you guys running/recommending?

I use a Primary Arms MD-ADS and it is perfect IMHO.  The Trijicon sights are extremely nice but I'm happy as a lark w/ the PA.

Personally I'd go with an RMR and low profile mount

I looked briefly into the RMR/Micro red dots, but the smallest dot I could find was 3.25MOA.  Only thing I won't budge on is it must be no larger than 2 MOA.

The RM09 is 1moa


Even though you said no to the RM06 (3.25), personally that's the one I'd go with.

You choice is yours alone, but I am curious. Why no bigger than a 2 MOA dot. I wouldn't think a PS90 would be accurate to under 2 MOA.

I shoot my SBR'd PS90 pretty darn well for what it is, using the standard (sucky) OEM white ring sight. I can shoot it about as well as my AR offhand slow-fire with a Geissele trigger. I don't know if that says more about the PS90s abilities or less about my marksmanship with AR's. I shoot the PS90 pretty darn well, it is more accurate than a lot will give it credit for, and that it shoots straighter than a tiny PDW should given its limitations.

My point with that is to say this: it's still not a bench gun, and I feel in no way hindered by the OEM sight aside from speed. I think at the end of the day any of the RMRs save for the 13MOA dot version would work great. If you're trying to shoot tinier groups than 6.5MOA, you're shooting the PS90 for groups off a bench, which is a waste of a PS90 in terms of use. A 6.5 MOA dot will get you easy hits well outside the effective range of the 5.7, and shoot to roughly the constraints of the rifle anyway.

Other alternatives are the Aimpoint Micro (2 MOA), and Trijicon MRO (2MOA) /mini ACOG lines (triangle, 2MOA circle dot, etc). PS90 mounts specific to both exist that allow you to mount lower as HOB is an issue with rail mounted optics on the PS90. I believe Tros make the ACOG mounts and Design Machines makes RMR/Aimpoint mounts. Both makers seem to yield high quality mounts. This route is how I would go if replacing my OEM unit.

Which low profile mount? Does one of the Tros mounts work for a RMR?

There are a few options for RMR specific mounts like
https://fn57sale.com/product/ps90-rmr-mount-low-profile/ and combined with the TROS rai, even better.

Or http://dmachineri.com/node/7

Or if you want to keep the rail here is a very low profile option http://amsmachine.net/product-list/mrd-mounts/

Again, just me personally, I'd go with the design machine mount to get it as low as possible and it's a little cheaper.

Great info in this thread, thanks! Currently waiting for my form 1 stamp for my PS90.

2 MOA dot mainly because I'm not using this thing on man size targets, usually opossums, armadillos, coons, etc.  At 100 or 150 yds the dots tend (for me anyway) to be too big and obscure too much of my target.  C7aea15 thanks for the heads up on the RM09 I missed that one.  I'm still leaning toward the MRO mainly because its American made, and the price is certainly right.  Another thanks for all the mounting options that have been posted too.

What about lights?  You guys running tail caps with pressure switches?

Don't let the price of the RMR scare you off too much. My last RM06 I got from Opticsplanet was $450 something with free shipping. Call them up and see what they'll do, they'll at least price match.

I see $602 at Opticsplanet, who did you price match against? Thats pretty much the lowest price I can find on an RM06.

Honestly I can't remember, sorry, I'll look though.

I've never heard of them before, but opticsplanet did it.



I'm pretty sure I used slickguns at the time, but it looks like it's out of stock at most places. Is there an RMR shortage?

You can try making a 20% off offer at scopelist that will put it in the $480 range, which is still a good price.

Since I got the tritium replaced on my OEG I decided to put it on the PS90.  I kind of like it on there and since you don't really have to look through it the height is not an issue.

MRO all the way.  If you drop the gun in mud with the rmr it's useless.

I am running a green triangel RMR on a ADM high qd mount

I have an aimpoint micro on mine, still can't decide if I want to get a low pro mount.

Comp2 with TROS mount

Love mine with the mini ACOG on it. Eye relief is great and it comes up quick for close range shooting.

Agreed, I have the same setup as you. Mini acog in a tros mount. It is awesome!