I just saw this post after we spoke, but in case others are interested... Correct. These are fixed. The height is so the shooter can maintain the same posture/ head position when using any of the risers that i’m going to make. I envision (hope) some guys will have all of them and switch them out as required. I want the eye to be in about the same position with the zero as it will be with the 100. Draw it all out and they get pretty tall, zero being the tallest.