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  1. #11
    User
    Join Date
    Apr 2011
    Location
    JHB North
    Age
    48
    Posts
    3,951

    Default Re: rht sight question..

    Quote Originally Posted by M43 View Post
    Over the past year I have installed RHT fibre sights on 5 of our Glocks. According to RHT the 34/35 and the 21 uses the taller front site (But they say this depends on the shooter, if one doesn't work for you they will exchange it). I initially had the taller front sight on my G21 and it shot 5 inches low at 10 meters. RHT exchanged it for me and it now shoots POA/POI. I use the same height front sight on everything from the G26 to the G21 and they work perfectly. I have shot someone else's G34 with the standard / lower front and it shoots to the same POI as my G17 and G22.

    And RHT are very good about looking after their customers. A while ago I had a rear sight that wasn't as tight a fit as it should be (It was loose and sloped backward with the screw tightened, causing glare.) RHT took one look at it and exchanged it right there, and I didn't even buy it from them.
    So one flavour does fit for most people, it is good to know that if it doesn't plans can be made.

  2. #12

    Default Re: rht sight question..

    Quote Originally Posted by M43 View Post
    Over the past year I have installed RHT fibre sights on 5 of our Glocks. According to RHT the 34/35 and the 21 uses the taller front site (But they say this depends on the shooter, if one doesn't work for you they will exchange it). I initially had the taller front sight on my G21 and it shot 5 inches low at 10 meters. RHT exchanged it for me and it now shoots POA/POI. I use the same height front sight on everything from the G26 to the G21 and they work perfectly. I have shot someone else's G34 with the standard / lower front and it shoots to the same POI as my G17 and G22.

    And RHT are very good about looking after their customers. A while ago I had a rear sight that wasn't as tight a fit as it should be (It was loose and sloped backward with the screw tightened, causing glare.) RHT took one look at it and exchanged it right there, and I didn't even buy it from them.
    It's impossible for the POI to change by 5 inches at 10m by changing the height of the front sight by 0.03 inches, or 0.762mm. Best to work out the change in POI yourself.

    Ignoring bullet drop (which is a valid assumption for short to medium distances) the following relation holds:
    [(change in height of front sight)/(sight radius)]=[(change in POI)/(distance of shot)]

    Taking the G34 as example, the POI will change by 4cm at 10m, and by 10cm at 25m. The change is bigger the smaller the sight radius, but it is still only 5.6cm at 10m and 14cm at 25m for the G26.

  3. #13
    User
    Join Date
    Aug 2012
    Location
    The moral high-ground
    Age
    52
    Posts
    3,001

    Default Re: rht sight question..

    Quote Originally Posted by wernswa View Post
    It's impossible for the POI to change by 5 inches at 10m by changing the height of the front sight by 0.03 inches, or 0.762mm. Best to work out the change in POI yourself.
    If we managed to actually measure the difference between the front sight that I initially had on my G21 and the one that replaced it your calculation would be of value. But we didn't...

    With the tall front sight (which is visibly a lot taller than the lower one) my gun would print just above the bottom of the 8 inch zero down circle of an IDPA target with my point of aim the top of the circle at 10 meters. I would call that about 5 inches give or take. With the lower front sight I am hitting the top of the line if I aim at the top of the line. This means the shift in impact is...5 inches (give or take). The calculation may be sound but it will only be relevant if you recorded the actual measured heights of both sights.

    What comes from the engineering shop and what you read in the brochure isn't always the same thing. Read the part of my post about the rear sight they replaced for me because it was out of spec...

  4. #14

    Default Re: rht sight question..

    Quote Originally Posted by M43 View Post
    The calculation may be sound but it will only be relevant if you recorded the actual measured heights of both sights.

    What comes from the engineering shop and what you read in the brochure isn't always the same thing. Read the part of my post about the rear sight they replaced for me because it was out of spec...
    So, for the POI to change by 5 inches at 10m, the height difference of the front sights must be 2,17mm, but it is specified to be 0,762mm. That is more than simple "manufacturing tolerance" or "out of spec." Even if, by chance, you got two front sights that are so far out of spec, it does not help the OP.

    Look, the physics and math is what it is, you can't shoot better than that.

  5. #15
    User
    Join Date
    May 2014
    Location
    JHB
    Posts
    2,657

    Default Re: rht sight question..

    Quote Originally Posted by wernswa View Post
    So, for the POI to change by 5 inches at 10m, the height difference of the front sights must be 2,17mm, but it is specified to be 0,762mm. That is more than simple "manufacturing tolerance" or "out of spec." Even if, by chance, you got two front sights that are so far out of spec, it does not help the OP.

    Look, the physics and math is what it is, you can't shoot better than that.
    He's right you know ^^^

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