Acog with red dot on top, how to zero red dot?

**Twilk73** · 05-26-20, 21:01

The idea is to lean the rifle to your weak eye and the red dot comes into view. Great in theory but what if your room clearing and switch the rifle to your weak side and now when you rotate the rifle the red dot is angled the opposite direction. So your poi is going to be off to the side. So I was thinking when I rotate the rifle to my weak eye I'm only rotating it a few degrees so I decided to zero the red dot straight up and down. The issue now is nothing is simple I have to make sure I compensate for being off one way or the other plus height over bor. I haven't shot this setup yet so I'm just thinking in my own head.

Im wondering how others with this setup work it. It's not the ultimate setup for me because I need the red dot to be the dominate optic and the 4x secondary. In this setup the red dot is secondary.

First post here, I got the boot from that other ar forum unfortunately so I'm learning to navigate this one.

**ExplorinInTheWoods** · 05-26-20, 21:56

My experience is with 45 degree offset rmr’s but honestly I would just zero it straight up and down. Instead of trying to figure whatever can’t you think you’ll be at. It will be easier to adjust and zero it that way. If you’re running a piggy backed rmr like that rolling it shouldn’t make a difference in room distances. I would just be more focused on your height over bore and learning that. It doesn’t even need to be your non dominant eye, with the piggy back rmr you can be at what would almost be a depressed muzzle with a normal optic but be able to sue the rmr. With that set up it’s just going to be a lot of practice getting used to an optic that high and secondly getting range time for rmr.

**Twilk73** · 05-26-20, 23:32

These kind of follow my thoughts aswell. Keep it simple, honestly if I chin weld the stock the rmr is right in my sight line. But if I mess that up I find myself searching for the dot. It's actually easier and faster to roll the rifle into my none dominant eye. I'm pretty good at the bindob concept but not as fast as with just a red dot. I should just be building a second rifle. I want a close to medium range erudite with a max range of 400 yards. I might try an lpvo out.

**1168** · 05-27-20, 05:45

I think you’re overthinking it. Its a valid setup. Z it straight up and down. I’d do it at 50. Do a bazillion dry reps bringing the optic to your eye. Practice dealing with the ~3” of offset at close range when training live. If it still doesn’t work for you sell it on the EE.

**RHINOWSO** · 05-31-20, 22:25

I do it all at 100, but otherwise I just bipod the rifle with the primary optic on target at 100 then sync the RMR with that POA.

Then I confirm it via live fire. I have an RMR on top of a NF 2.5-10x24 and hit steel out to 350 with it.

Up close the offset is noticeable but I just aim for the top of the chest or head to get what I am looking for.

**Lawdog-1** · 09-01-20, 11:40

RMR 25yds. Max. Long ranger use 4x acog.

**Lawdog-1** · 09-01-20, 11:42

Red Dot is for CQB Only Right eye.

**maximus83** · 09-01-20, 13:27

For folks who've tried both, is there any strong reason to prefer offset vs top mounted RDS? I've only tried offset, but considering top mount on a new DMR-ish setup where I have a Badger C1 mount, they have a ring cap where I can mount my T1 on top (they also have an offset option).

**Pappabear** · 09-01-20, 16:10

I've run both and the one on top didn't bother me as much as many folks dislike. But I'd zero at 25 yards and know your POI at 5-10-15-20-25 yards because the offset is substantial. And not try to use at any further distances, CQB only. My chin weld worked fine for me.

People like offset so they can maintain cheek weld and not have the big space between optics causing POI challenges.

PB