Which Riser do I need for a Bushnell trs 25 on an AR?

[44minimum]

I got one of these red dot sights from Midway but I didn't know that it needed a riser to co-witness with the sites. Which one do I need to get it to line up properly with standard height AR sites?

 

[cmhbob]

I got this one: UTG Medium Profile Riser Mount with 3 slots

 

[Gabriel42]

I got this one: UTG Medium Profile Riser Mount with 3 slots

That is the exact one I used as well until I switched to an Aimpoint H1 in a Larue tall mount. Same profile.

 

[henschman]

Yep, go with the Medium one if you want absolute co-witness, and the High one if you want lower 1/3 co-witness.

 

[SDarkRage]

The medium UTG one works great on my dads AR. Perfect co witness.

 

[Mr.Glock]

I got one of these red dot sights from Midway but I didn't know that it needed a riser to co-witness with the sites. Which one do I need to get it to line up properly with standard height AR sites?

Have you thought about 45degree' mounting it. I did and I like it much better. I opted for the left side, tilt to the right which discharges the shells out and down. Just a idea. I used the Bushnell TRS25 for a long time. They are pretty tough.