Dual optics on AR, Scope & Mini Red Dot

[Call_me_Tom]

I'm wondering if anyone else is running a setup like this. I recently set up my AR with a scope/MRD combo. I had it attached so I could still run BUIS but I noticed that the MRD was very close to the ejection port.

I've not fired the AR yet but I did move the MRD forward of the scope. If you look at the thread below you can see how I had it originally setup. I'm not home right now so I don't have any recent pictures with the MRD forward of the scope.

http://www.calguns.net/calgunforum/showthread.php?t=698612

Does anyone know if the MRD between the scope and BUIS like what is posted in the above thread would interfere with the ejection of shells?

[lavey29]

I looked at your earlier pics. You can't really go wrong moving the MRD forward because eye relief is not a concern but blocking the ejection port is. The only thing I see as a potential problem is field of view when going 2 eyes open on the MRD. Does canting the rifle have any affect on your left eye field of view like is the scope partially blocking your sight?

I am going to add a RMR to my ACOG at some point and am considering the 45% offset forward mount but I have wondered about this.

[Call_me_Tom]

There is some blockage when shooting with two eyes but it really isn't that noticeable. If I'm canted using the MRD I don't notice the blockage on my left eye unless I close my right eye and then I notice the scope. Canted at 1 o'clock or 45* your left eye is lightly above the scope and between the elevation and windage turrets.

[negolien]

Yup you want it to be behind the port nub or in front of the ejection port a little. It doesn't have anything to do with seeing properly. It has to do with your rounds coming out and hitting your red dot.

[HighLander51]

Most guys running Open set them up like this.

[Call_me_Tom]

Most guys running Open set them up like this.

Because I had a BUIS my MRD was very close to the ejection port which is why I moved the MRD forward of the scope.

[negolien]

Yup I would be nervous running where that guy is even though it works for him. He's right over the ejection nub then again his reflex is smaller. 10-1 says the ejected cases hit that.

[GeoffLinder]

Most guys running Open set them up like this.

Not everyone does, I much prefer the secondary red dot out on the hand guard like shown here:



I use a short piece of rail supplied by JP rifles on the hand guard. This keeps the red dot real low and minimizes POA to POI offset on close targets compared to the slightly further from bore center to red dot arrangement you get back on the receiver. This requires no head movement from existing cheek weld when canting rifle to use red dot. It also provides a less cluttered field of view than having the red dot right in your face on the receiver.

http://www.jprifles.com/buy.php?item=JPTR-L

[negolien]

nice

Yeah that looks like it wouldn't be an issue with expanded brass lol. I still haven't decided what I am gonna go with since I sold my Eotech. I already have a reflex sight. I was going to go with the XS big dot 45 degree but alas I don't really have $150. I might just spend the $11 for a 45 degree mount and throw my Reflex on it for now. My AR is a tad overgassed so my brass goes to 2 0'clock no issues with brass hitting my reflex

[Call_me_Tom]

Not everyone does, I much prefer the secondary red dot out on the hand guard like shown here:



I use a short piece of rail supplied by JP rifles on the hand guard. This keeps the red dot real low and minimizes POA to POI offset on close targets compared to the slightly further from bore center to red dot arrangement you get back on the receiver. This requires no head movement from existing cheek weld when canting rifle to use red dot. It also provides a less cluttered field of view than having the red dot right in your face on the receiver.

http://www.jprifles.com/buy.php?item=JPTR-L

That is how I'm currently running my MRD, forward of the scope.

In regards to your comment on my other thread, you should really learn the difference between a carbine & a rifle before you try to be cute & end up sounding dumb.

[GeoffLinder]

That is how I'm currently running my MRD, forward of the scope.

In regards to your comment on my other thread, you should really learn the difference between a carbine & a rifle before you try to be cute & end up sounding dumb.

I know the difference, but it's still open to debate for many reasons. Here is what I just replied with in the other thread:

----------------------------------------------------

"I know, I know, there are many schools of thought on this. Some folks call short gas system's carbines, and full length gas system's (AKA rifle length) rifles.

Then there are the old school folks who call all AR's carbines in reference to the M1A being the only thing that should be called a rifle because it's .30 caliber.

Myself, I feel they are interchangeable and gas system length really doesn't matter.

But, yeah, 16" M4 = Carbine. 20" AR = Rifle. In most circles anyway

-----------------------------------------------------

The whole .223 versus .30 thing goes back many moons to the old "mouse gun" epithet old schoolers used when the AR was first introduced to the military. There was a lot of pushback about it not being a "real" rifle because it was not .30 caliber. This is where it started being called a "carbine" no mater what else (16"ers didn't exist back then so all AR's were carbines using this school of thought).

I remember when I started shooting NRA High Power Rifle in the mid-80's, I started with an AR in Service Rifle and everyone else was shooting M1A's. I took untold amounts of ridicule for it, they would start saying things like "squeak, squeak, I smell a mouse in the house" and "Somebody call an exterminator, I think we have a rodent problem". All in good fun, but now I get to play it back on them, some of the exact same folks who used to kid me about my "mouse gun" are now using AR's and their beloved M1A's are gathering dust in their safe.

Life has a strange way of changing the game on you

[Call_me_Tom]

I know the difference, but it's still open to debate for many reasons. Here is what I just replied with in the other thread:

----------------------------------------------------

"I know, I know, there are many schools of thought on this. Some folks call short gas system's carbines, and full length gas system's (AKA rifle length) rifles.

Then there are the old school folks who call all AR's carbines in reference to the M1A being the only thing that should be called a rifle because it's .30 caliber.

Myself, I feel they are interchangeable and gas system length really doesn't matter.

But, yeah, 16" M4 = Carbine. 20" AR = Rifle. In most circles anyway

-----------------------------------------------------

The whole .223 versus .30 thing goes back many moons to the old "mouse gun" epithet old schoolers used when the AR was first introduced to the military. There was a lot of pushback about it not being a "real" rifle because it was not .30 caliber. This is where it started being called a "carbine" no mater what else (16"ers didn't exist back then so all AR's were carbines using this school of thought).

I remember when I started shooting NRA High Power Rifle in the mid-80's, I started with an AR in Service Rifle and everyone else was shooting M1A's. I took untold amounts of ridicule for it, they would start saying things like "squeak, squeak, I smell a mouse in the house" and "Somebody call an exterminator, I think we have a rodent problem". All in good fun, but now I get to play it back on them, some of the exact same folks who used to kid me about my "mouse gun" are now using AR's and their beloved M1A's are gathering dust in their safe.

Life has a strange way of changing the game on you

http://www.calguns.net/calgunforum/showpost.php?p=10569953&postcount=17

[RuggedJay]

How would you shoot from weak shoulder /weak hand with a canted red dot?

[negolien]

I was so lost.

LOFL Tom. I thought you were talking to me I was like wtf did I say?
I had to search a couple of threads to understand what was going on

[GeoffLinder]

How would you shoot from weak shoulder /weak hand with a canted red dot?

Same way, just a little more cant, no problem at all. My right eye is what I center up, head is tilted left and pushed across the stock a little more.