1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

AR-15 NM Sights vs. A2 Standard Sights

Discussion in 'Rifle Country' started by ArmedBear, Mar 25, 2008.

  1. ArmedBear

    ArmedBear Well-Known Member

    Can anyone describe the difference between NM apertures and front sight posts, and standard A2 sights?

    My only real point of reference is a gun with the A2's. They're okay, but I could certainly imagine improvements.

    I'm thinking about ordering NM sights for a different build, but I don't know for sure whether I want them, since I don't know exactly how they're different.

    Is there a ghost-ring aperture, or are they both really small?

    How is the post different from an A2 post?

    Are they as useful as the A2's for all-purpose use (plinking, shorter range torso targets, etc.), or are they really just good for longer-range target shooting?

    Thanks in advance.
  2. 30Cal

    30Cal Well-Known Member

    Post is typically skinnier and the rear sight will be 1/2x1/2 or 1/4x1/4 MoA adjustments. The aperature is usually quite a bit smaller than the normal USGI one.

    They're intended for full-daylight conditions, shooting at a big black circle.
  3. Trebor

    Trebor Well-Known Member

    Unless you shoot NRA Service Rifle competition, you don't need the finer adjustments of the NM sights.

    Like 30Cal said, they are designed for a specific purpose and aren't really "general purpose" sights.
  4. 30Cal

    30Cal Well-Known Member

    If I was going to put them on a plain A2 upper, I'd go with 1/2x1/2's and get one with a standard GI sized aperture.
  5. ArmedBear

    ArmedBear Well-Known Member

    Thank you!

    Sounds like I sure don't want them for this build, which I want to put together for indoor-range use (.22LR dedicated upper).

    The only question remaining, then, is do I get an A2 upper, or spend more to have a flattop with a rear sight. It seems that there's always another way to spend more money on an AR, but it doesn't necessarily translate to added value... :)
  6. taliv

    taliv Moderator

    AB, i'd take the NM sights any time I'm shooting from a bench or for any type of bullseye competition, even indoors or close range. I'd take the regular sights any time I need faster sight pictures (because it has a much larger aperture)
  7. ArmedBear

    ArmedBear Well-Known Member


    Any point in using a NM front sight post on a carbine, instead of the standard, just so it doesn't appear too large?

    The standard post looks pretty big on my 20", though I was able to do well shooting casual offhand bullseye competition, using the small aperture at 30 yards.
  8. taliv

    taliv Moderator

    dunno, but you can get front sight posts in varying widths from at least .050 to .100 (with .070 and .080 being a popular middle widths)

    i'm not sure any of them are designated "NM", but i could be wrong on that. personally, i just went with the standard for lack of a compelling reason to do otherwise
  9. Onmilo

    Onmilo Well-Known Member

    For a dedicated .22LR upper, I would recommend a .050" round post 'National Match' front sight post.
    Plenty of side clearance for shooting rimfire dedicated targets to 100 meters, indoors or out.

    You could install a 1/4 MOA NM rear sight assembly for fine tuning to the targets.
    NM rear sights are far less likely to wander than the standard A2 set-up.
    Not too important on a combat rifle, very important on a .22LR target shooting rifle.
    If the apetures are too small for your tastes, you can enlarge them using wire guage drills and a hand held chuck type pin holder.
  10. Eightball

    Eightball Well-Known Member

    IIRC, NM sights are standardized around a 20" .223 for gradation and distance purposes. Not sure it would be worth it on the .22LR upper bit, and it would not be the best of ideas for a carbine, IMO. Don't quote me on things, though.
  11. asknight

    asknight Well-Known Member

    That's precisely what I did on a 20" A2. I believe it was a 0.040" post. It allowed my longer distance groups to noticeably decrease since the post obscured less of the bullseye.
  12. ArmedBear

    ArmedBear Well-Known Member

    Aw hell, I just ordered the thing with standard A2 parts, because there are all sorts of neat-o options out there, but I will need to do some testing and measurement before I spend more money. It's hard to even decide what I want, just by guessing wildly.

    Like asknight, my issue with the A2 sights is not so much that I can't center them reliably, especially in the standard small aperture. The big square post obscuring the bullseye, especially since I have a bit of astigmatism in my right eye, is a bigger deal.

    So, I'm thinking about looking at sight posts from these guys: http://knsprecisioninc.com/

    However, I can do that later anyway, since these are strictly aftermarket bits, and they have so damned many options, I'll have to shoot the gun before I can decide. :)


    Thanks, all!

Share This Page