Quick Newbie Question About Iron Sights

[Neville]

Newbie here, question about iron sights. As I understand it: When you zero in your irons its done by adjusting the rear sight. A friend zeroed it in for me. If I wanted to switch out my front flip up sight for a fixed sight, would I have to re-zero the rifle, or should it technically be zeroed already?
 
Edit: Thanks for the quick answers guys

[2old4thisshiz]

Zeroing requires adjustments to both front and rear iron sights.

[McGobs]

Even if you removed the front sight and put it back on, you’d still want to re-zero in the same manner as before. It’s very nice when things zero back up exactly as before, but my understanding is that’s more due to luck than anything else. Thus, you must re-zero after swapping the front sight out.

[rwoooshed]

Yes, you need to do it again. It’s zeroed on your current front flip-up sight, not on the one you’re going to replace it with.

[rolBot]

F.O.R.S. = front opposite, rear the same.

I wish some one had told me this, bc I didnt fully understand my irons to begin with. Your front sight is elevation, so if you are trying to shoot higher, move the post down(opposite). Back sight is windage(left and right), so if you need to shoot further to the right, adjust to the right(same).

Idk if this is pertinent info, but there’s better explanations on YouTube or just Google it

[Protorin]

Anytime you move the sights or change them out they need to re-zero. Even if you just take them off and replace them you should technically reconfirm your zero.

[Florida-Steve]

It may be close, but to verify you will want to shoot a group of 3 to 5 rounds and if you need to make adjustments, then you can start from there, but because of variations between manufacturers and you will have no idea of the vertical adjustment of the front sight (the front sight on an AR is used to adjust the vertical, while the rear normally only adjusts the horizontal)