whats the term called

[stonegraham]

When you have peep type sights and also something like a red dot sight, and set it up so
that when you are looking thru the peep sight, it's aligned with the red dot also?
It's on the tip of my tongue.....co- something, I think.
Someone help me with this term?

 

[Ppartin4570]

Co-witness

 

[MinnesotaHunter]

co-witnessed