Running an ACOG 4x and a 45 deg. T-1

**pathfinderheli** · 03-02-13, 22:07

I'm building an upper and planning on using an ACOG but also having a T-1 in a 45 deg. offset mount....

Quick question... ACOG's (the one I have) is designed for a 100M zero.... I typically use a 50M zero on my RDS.

Would one want to use two different zeros? The T-1 is for up close work and I guess a 100M zero isn't going to make much difference....

Just wonding what guys with this set up are running for zeros?

**ramairthree** · 03-02-13, 22:39

I messed around with an offset RD on a JP rail and a scope for a while.

You buy a closer to bore mount vs. on top of the scope, and trade that little shift to use it like offset irons.

I was using a cheap little fast fire type RD from a kid's 22 to try it out. The scope had a BDC based on a 100 zero. I did a 50m zero on the RD.

Worked fine. There was an inch or less of difference in point of impact out to 200.

I have only been messing around with offset irons for less than a year. I like them as backup to a scope so I can keep the scope low. For whatever reason though, I found I personally prefer a RD on top of the scope vs. offset.

I did not have long term, hard corps experience with the offset RD. YMMV.

**Koshinn** · 03-02-13, 22:39

Originally Posted by pathfinderheli

I'm building an upper and planning on using an ACOG but also having a T-1 in a 45 deg. offset mount....

Quick question... ACOG's (the one I have) is designed for a 100M zero.... I typically use a 50M zero on my RDS.

Would one want to use two different zeros? The T-1 is for up close work and I guess a 100M zero isn't going to make much difference....

Just wonding what guys with this set up are running for zeros?

What type of gun is it? Caliber? Barrel length?

Honestly, 100m zero for both sounds good. From 0-100 m on your t1, you'll be shooting < 3" low. So aim center of head or mass and pull the trigger, no complicated hold over to worry about. If you're really close, aim slightly high.

**TactTeam** · 03-02-13, 23:15

If it were me, I wouldn't buy the T-1 for an offset unless you already have it in the toolbox. You can get a smaller, quality reflex like the RMR for a lot less that will handle the job wonderfully.

My personal rifle has a leupold 3-9 with a 45 offset fastfire on a warne tactical mount. I have the 3-9 zeroed at 100 and the fastfire zeroed at 25. The typical holdoff offset for a red dot deminishes at 50 yds.

This is how I see it. With a 25 yd reflex zero from 0-25 you will have to hold high ever so slightly due to the barrel/sight difference. From 25-100 it should bridge the gap with a minimal difference with the round impacting high.

Two team guys have an acog with an RMR. One mounted on top of the acog and one at a 45. With the 45 mounted acog/RMR they work together pretty flawlessly. The rmr for cqb out to around 75 and then switching to the acog out to about 500-600.

**Taprackngo** · 03-02-13, 23:29

I have that setup on my 6920. I really like it. Mine is set to 100yds, but really not to much difference in POI closer either.

**Failure2Stop** · 03-03-13, 09:16

To directly answer your question; I prefer a 100 meter zero for both.

To give some unasked advice; the 4x plus 1x optic combo is a poor solution, with a whole lot of capability redundancy.

Typos brought to you via Tapatalk and autocorrect.

**misanthropist** · 03-03-13, 21:01

Originally Posted by Failure2Stop

To directly answer your question; I prefer a 100 meter zero for both.

To give some unasked advice; the 4x plus 1x optic combo is a poor solution, with a whole lot of capability redundancy.

Typos brought to you via Tapatalk and autocorrect.

I know the concept I'm about to propose has some serious drawbacks, but I have always thought it so I'm just going to throw it out there...

I have always wished there was a good way to have an aimpoint as the primary optic, with an offset 4x or 6x.

99% of the time I just want a red dot.

1% of the time, the ability to look further and shoot more precisely would be handy.

For obvious reasons, when running a dual fixed optic setup the offset optic is always the red dot...but man, it would be nice do be able to do it the other way around.

If that were possible I think I'd actually really like a dual optic system.

**TactTeam** · 03-03-13, 23:39

Originally Posted by misanthropist

I know the concept I'm about to propose has some serious drawbacks, but I have always thought it so I'm just going to throw it out there...

I have always wished there was a good way to have an aimpoint as the primary optic, with an offset 4x or 6x.

99% of the time I just want a red dot.

1% of the time, the ability to look further and shoot more precisely would be handy.

For obvious reasons, when running a dual fixed optic setup the offset optic is always the red dot...but man, it would be nice do be able to do it the other way around.

If that were possible I think I'd actually really like a dual optic system.

Have you looked at a red dot with a nice push to side magnifier?

**misanthropist** · 03-04-13, 00:18

Yes, but you don't have the optic that's actually optimized for longer shots. You just have a magnified (obviously) image of a sub-optimal reticle and so on. I agree that it's workable but, as usual, not quite the exact solution I have in my head.