I saw a UTube Video about that combination of EOTECH sights. I think that together they weight almost 2 lbs.
Shipping weight on this combo is a little over 2lbs.
http://www.amazon.com/Eotech-HHS-EXPS3-4...=eotech+exps3-4
They do add weight to the AR15.
But to compare my Rock River Arms (RRA) Scope Dual Rings on single Riser and my Nikon M-223 4x16x43 600 BDC reticle scope weights a few ounces more.
My Ambush Firearms 5.56 AR15 from Daniel Defense's Ambush Firearms Hunting Subsidiarity company weights about 7.4 lbs and with the Nikon Scope and the RRA scope rings/riser add up to about 10 lbs total.
So both systems make the gun heavier.
Now a question for your since you already have the EOTECH EXPS3-4. I'm thinking about getting one of those for close in work on night time coyotes. If a coyote gets in close before I see it in the light I want something on my AR15 to be able to shoot up close and fast.
How well can you see at night with the EOTECH EXPS3-4. And if you were to use a light on the 1913 Picatinny rail of the AR15 will that let you see the coyotes at night using the EOTECH holographic sight?
I don't think my Nikon even when set to 4x (lowest Magnification Setting) will get on a close in coyote that's moving fast at night. Even with a Wicked 400 White light it would be hard to sight in on a fast moving close coyote on a night stand.
I've got some Magpul OEM Gen Two back up sights on my AR15 now but I have to take the Nikon Scope/RRA combo off the rifle to install the Rear Magpul BUS. I need a screw driver to take off and install both the RRA scope rings and the Magpul BUS.
I like the idea that the EOTECH EXPS3-4 has a quick attach/detach lever on it. And it can be used with the EOTECH or other night vision devices in the future as the buttons are on the side not the rear.
I need to do some research and find out more about this EOTECH sight and find a place to get a good price deal on the unit. I like the fact that one can add the night vision to it later or add the magnifier to it at a later time. I understand that the magnifier is 3x or 3.5 x and also has a quick detach level on it. And the magnifier device 3rd gen will flip over to the side and out of the way of the Holographic sight quickly or it can be quickly snapped back in place.
I'm at a point where I have to go to the range and zero the Nikon Scope with the AR15 and also get the Magpul BUS sights zeroed at the range.
If I had the EOTECH I could keep it on the rifle along with the Magpul back up sight maybe. I guess I can put the Magpul on the Back end of the Picatinny rail as far back as possible and then still use the EOTECH on the rail? Now if I add both the Magnifier and the Holographic sight I don't think I would have room to add the read Magpul BUS. Is that true?
As for the weight of the rifle I have a Magpul MS3 Sling, Magpul ASAP end plate and a Magpul RSA on the front 3" long Picatinny rail on the AR15 that can be used to carry the rifle over the shoulder or up front in a single point sling setup. The sling converts from a two point sling to a one point type sling. And then I'll be putting the AR15 on a Caldwell Magnum DeadShot FieldPod to support it while on the stand at night. I plan on setting up the FieldPod to use in the standing position so that I can walk around the FieldPod and swing the AR15 around 360 deg in case a coyote comes in from behind me or an unexpected angle.
Right now once I get the Magpul BUS and Nikon Scope zeroed in at the range I can use either one of them. I plan on using the Nikon during daylight hours in large fields and the Magpul BUS at night or in a heavy wooded area. IE for up close work with a light on the AR15 at night. I can also add the EOTech onto the rail and still use the MAGPUL Back up Sights as they are 1/3 co witness in the sights. So if the light fails to work on the EOTech I can still shoot with the Back Up sights without removing the EXPS3-4 or the G33 scope.