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-   -   Riser for Bushnell TRS-25 (http://www.firearmstalk.com/forums/f20/riser-bushnell-trs-25-a-64264/)

jgand72 05-11-2012 02:32 PM

Riser for Bushnell TRS-25
 
Hey all,

I just received my Bushnell TRS-25 red dot in the mail. However, I am up at school and do no have my rifle with me. So my question to you all is: Does anyone know what size riser would give me a 1/3 co-witness on a flat top AR with the A2 front sight post? I was thinking a 1", but I wanted to get some of your opinions. Thanks!

JTJ 05-11-2012 02:35 PM

3/4" will give you a center co witness with the dot on top of the post.

jgand72 05-11-2012 02:49 PM

Quote:

Originally Posted by JTJ (Post 797173)
3/4" will give you a center co witness with the dot on top of the post.

Awesome, so I'll go with the 1". Thanks!:cool:

connectegr 05-11-2012 04:13 PM

Why such a high riser? I am mounting a similar Sig Red Dot this weekend. What is "1/3 co witness"?

purehavoc 05-11-2012 04:17 PM

Quote:

Originally Posted by connectegr (Post 797277)
Why such a high riser? I am mounting a similar Sig Red Dot this weekend. What is "1/3 co witness"?

http://img.photobucket.com/albums/v5...r/cowit1-1.jpg

connectegr 05-11-2012 04:27 PM

I was planning to use "absolute cowitness", iron sight and red dot both centered on top of post. What is the advantage of using the lower 1/3?

If I use absolute cowitness, is a riser necessary? Is so, how much?

purehavoc 05-11-2012 04:48 PM

Quote:

Originally Posted by connectegr (Post 797289)
I was planning to use "absolute cowitness", iron sight and red dot both centered on top of post. What is the advantage of using the lower 1/3?

If I use absolute cowitness, is a riser necessary? Is so, how much?

its really personal preference , I prefer the lower 1/3 because when I use the RDS I dont have all that sight taking up the whole sight picture . and when I do need to use my irons my RDS wont be on anyway . Either way I have more sight picture thru the RDS with lower 1/3 . again its really personal preference

Quentin 05-11-2012 05:02 PM

I also use the bottom 1/3 cowitness for the reasons purehavoc stated. I can look over the irons and just use the dot or look through the aperture and lollipop the dot on the front sight. One disadvantage of absolute is the red dot appears to dim when looking through the aperture - this is very noticeable to me.

jgand72 05-11-2012 05:25 PM

When I had a Bushnell Holosight, though it was definitely usable, I was not crazy about having the front sight take up much of the picture. I feel that if I am using a red dot, I am using it for the dot, not the front sight post. Everyone has they're preference, I just want to try out the lower 1/3 and see how I like it.

jgand72 05-11-2012 05:29 PM

Oh and another question, which may be a stupid one, but will I need a cheek riser? I have no experience with using risers.


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