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Thread: Do Trijicon HD Night Sights shoot 'a bit' higher than stock M&P Sights?

  1. #21
    Member
    Join Date
    Feb 2011
    Location
    Utah
    Quote Originally Posted by Llando88 View Post
    PS I use sight picture #2, consistently.


    Just to add a data pont, I have a pair of M&P9 full size pistols with Trijicon HD sights. I use image 1 with both of them at 25 yards.

  2. #22
    Chasing the Horizon RJ's Avatar
    Join Date
    Jan 2014
    So just a quick update on how this worked out.

    Below pic is from 10/25. It is typical of the groups I am shooting now. I was shooting 124 WWB target ammo, at 7 yards in this case. With the stock rear and 10 8 FO front, looks like I'm much closer in elevation now.


  3. #23
    Member
    Join Date
    May 2014
    Location
    South Central Us
    Quote Originally Posted by Llando88 View Post
    Been shooting a while, and I've been thinking, I'm pretty consistent now in my POI. The thing is, my POI is typically a bit high, say a couple inches, from my point of aim.

    I was looking at my Trijicon HD sights, in relation to the stock sights. I noticed that the stock sight heights were much more aligned, in relative height, than the heights of the Trijicon sights.

    So, I collected some data on sight dimensions from around the web, and, using the Trijicon OEM data, did the following analysis (all using height above slide):

    Stock S&W FS9 (unverified numbers, web search)

    Front Sight
    Width: 0.130, Height: 0.160 (from slide), 0.230 (total)

    Rear Sight
    Notch: 0.140, Height: 0.170 (from slide), 0.240

    Trijicon HD SA137Y (Trijicon web site)

    Front Sight
    Blade Width (A) Blade Height (B) Overall Height (C)
    0.144 in. 0.215 in. 0.282 in.

    Rear Sight
    Notch Width (D) Blade Height (E) Overall Height (F)
    0.169 in. 0.292 in. 0.382 in.

    1) Stock Angle over sight radius:

    Tan( ) = (0.170 - 0.160) / 6.5" = 0.01" / 6.5"

    ( ) = 0.0881 deg

    2) Trijicon HD over sight radius:

    Tan( ) = (0.292" - 0.215") / 6.5" = 0.0770" / 6.5"

    ( ) = 0.6787 deg

    3) Delta of sight radius angle, HD and Stock:

    0.6787 deg - 0.0881 deg = 0.5906 deg

    (Meaning HD sights heel the pistol up, inelevation, 0.5906 deg "more" the stock sights.)

    4) The effect of 0.5906 deg over 7 yd / 21 ft / 252 inches:

    Sin ( 0.5906 ) * 252" = 2.59"

    (Meaning HD sights will shoot 2.59" higher than stock, all being equal.)

    I consistently shoot almost exactly 2 to 3" high on my M&P FS9 at the range with my Trijicon HD sights.

    I think it's the Trijicon HD sight height differences.

    Am I wrong?
    I have Trijicon HD sights on my M&P9 , and Frank Proctor commented that yes, it did shoot a touch high for him, but otherwise was bang on. I asked him to shoot my pistol to confirm that any error is my fault and not the weapon's. I consider that he probably can shoot better than myself, so I took his word for it. Sight image #2 is what he described as was happening.

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