Hello,

I just got a 2x7x32 long eye relief scope for a late Christmas gift from one of my buddies. Since it is long eye relief I am running into the problem of how far I can mount it on the receiver.
I do have a extended quad rail on the rifle that has the receiver and the hand guard rails match up with just a bit of a gap because of the delta ring. (See pics)

Now I am getting a 1" Monstrum high riser for it cause my .50 inch one I get front A2 sight post shadow a bit. Now my main question with that new riser and it is 5.7" in length can it use it to join the receiver and the hand guard to help move the scope farther away to get the correct eye relief. (pics)
Here is a demonstration of what I am taking about with my 3.3" .50" riser that I have for my BSA red dot. this pic shows the riser joining the receiver and my hand gaurd together.
Will this work in keeping the scope level and on target or will it throw it off. Or is there a mount that I can get to push it up higher and farther so the long eye relief will work and clear the front sight post shadow that I get with that .5" mount.
Thank you for all your replies.

Attached Images

	Scope 007.jpg (102.8 KB, 104 views)
	053.jpg (39.3 KB, 72 views)

As long as the forearm is solid, that should work.

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yeah that hand guard is going nowhere, I ask this cause I have read on other forums not to mount the scope to the hand guard rail, but in this case I am joining the upper hand guard rail and the upper receiver rail with that riser and it doesn't move at all.
Thank you for your reply, I think it should work, why else would they design quad rails with upper rails installed on them and others that match right up to your uppers receiver rail when you install them.

UTG makes a drop in slim light weight rail that has the upper rail join up with the receivers rail. This one I got is a Global Military Group Extended drop in quad rail. I want to get the UTG bipod that Nutnfancy did a review on here next for it.
I also want to build a new AR here maybe at tax time.

Yes it'll work, but spanning the receiver and handguard like that reminds me of duct tape.

Suggest considering a one piece scope mount designed for an AR platform to push the scope forward while keeping mounted on receiver. I've seen the Burris PEPR on sale lately for well under $100. Or take a look at Primary Arms.

Thanks for the information, I looked into those Primary Arms mounts and that looked great. All I know is that scope I got has a long eye relief I always u NTCH hold when sighting with my irons and was told to do the same with a scope also but with this scope if I use the NTCH hold I am going to need the scope farther up, because of it's so long eye relief.

Also duck tape, why is that like using duck tape,lol. If you are not to mount anything to your upper rail on the hand guard then why is it there. If you cannot use it for optic mounting then remove the extra useless weight.

On that we agree. If the only reason you put a quad rail on your rifle was to mount a magnified scope to it, then just take off the useless weight. A one piece extended mount is better for scope mounting and eye relief issues.

Well then why do they make all those hand guards with upper rails then. Why not just the 3,6 and 90'clock positions. I will try that Monstrum Tactical riser. Since it will still be mounted on the receivers rail and the hand guards upper rail it should be fine. Then maybe down the line when I get some more money get the proper mount for it, but I am not even sure if it would still be far enough up for my eye relief.
I will just have to wait till spring and get it to the range and see how it shoots. I hate this time of year, cannot get out and shoot now.

People mount sighting systems on the forearm all the time. I agree that it is not the best, but that doesn't mean it won't work. The receiver top is by far the most stable, but for 1MOA what the OP has described is fine unless the forearm is loose.

Le me come at this from another way. Pinger, have you actually checked the eye relief with the scope mounted as you suggest? Or, are you just mounting it there based on what someone else told you?

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No I have been looking through the scope mounted on the rifle, pointed and unloaded in a safe direction of course. and if it is to close to the NTCH style of shooting the cross hairs are way to small. I got this scope as a gift and noticed in the instructions say that the eye relief is 8.7-10.65 inches. I am thinking that this scope is for a handgun instead or a rifle but the instructions clearly call it a rifle scope.

That hand guard is not loose at all very sturdy hand guard.

I wouldn't mount a sight that I planned to do any precision shooting with on a drop-in rail. There is a reason the standard A2 sight is mounted directly to the barrel. The barrel is attached directly to the upper. Any drop in handguard relying on the delta ring and handguard cap will move enough to affect accuracy outside of 50 yards.

Well it won't completely be mounted on just the hand guards rail it will be joined with the receivers rail also. What about on a free float rail. Also this GMG extended quad rail is very solid and has not one inch of movement.
That also goes back to my original question, why do they make all these quad rails drop in or free floated with upper rails then for looks I guess.
I am mounting this on this riser it is 5.7" long and 1" high, it will evenly join my hand guard and upper receivers rails together. I also used a level on it and they match up completely level.

Attached Images

riser.jpg (8.7 KB, 15 views)

Your handguard is attached to barrel. Barrel flexes (whips) when shot, and you're adding a bipod to the handguard which induces even more movement. The reciever is not flexing or moving. Attaching a mount that spans both is not ideal, nor dime store mounting concoctions.

Jacking up the optic with a one inch riser and whatever rings is going to impact cheek weld. On an AR platform, an optic is typically mounted for a centerline of around 1.5in (consistent with the hieght of irons). Your scope is likely 1in, so you're already at 1.5in before rings with a 1in riser. The rings you have look to be .5-.75in which puts the centerline at 2-2.25in high. Cheek risers for the stock are an option.

The higher the optic is above bore the greater difference there will be for holdover/under at distance beyond zero. Sight over bore with an AR is already about 2.5in which is quite significant. Exaggerating that difference is not ideal.

What you put on your rifle or how you do it is your business. I was originally just trying to answer your question in the OP about other mount options to move it forward. Enjoy your rifle how you wish, including mounting a pistol scope to a AR15. That said, with these rifles quite often one poor choice leads to another and another in an attempt to adapt to the first poor choice. And that's how AR parts boxes are started.

cantilever mount?

Bingo. A mount like this.

OK, I must apologize. I was thinking the OP had a free float hand guard, he doesn't. That changes everything.

With that in mind, I'd be curious to see the scope mounted only on the hand guard. That way, if there's any movement in the barrel, the scope will move with it.

No, that mount won't work at all with this scope.

Y'all are missing this:
With even the longest cantilever mount on the planet, he won't get 9"-10" of eye relief. He has a "scout" scope. Those are intended to be mounted further toward the muzzle.

Actually, when you consider the necessary eye relief, even talking about spanning the receiver and forearm is moot. Even that position is not far enough down the line for this scope.

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For the record, a free float forearm is attached to the receiver. This essentially makes it part of the receiver. In that setup, I think it'd be OK to span the two.

A drop in forearm is sandwiched between the front sight and the receiver (delta ring). No matter how stable you think it is, it's not stable enough for an optic. The zero will be constantly changing.

So, if you want to use this scope, you'll need a free float forearm.

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I totally agree with "Rastoff". Any AR scope needs to be either mounted solely on the receiver or mounted solely on the forearm rail. In this case with this scope it is the later. The important thing with any sight system is that it be back in the original position at the next pull of the trigger. ............ Big Cholla

I knew you'd come around.
You're right, there is a mix of lessons here.

Mounting an optic fully forward on an AR handguard, free float or not, isn't that uncommon. Usually a 1x red dot.

That the one piece mount pictured above will not work with the scope isn't necessarily true. A scope that allows for a great amount of eye relief doesn't necessarily require it. I've got a pistol scope that has up to 17in of eye relief. It is perfectly usable at 6in.

As far as mounting a scout or pistol scope to an AR handguard with cobbled together dime store mounts and rings is the wrong optic with the wrong hardware, and the front of the scope will be right up against the front sight on a carbine. Hey, get a tall riser to tower above, right? Then get a cheek riser... and then... . As said earlier, one poor choice often leads to another and another in an effort to adapt to the first poor choice. I don't see this effort as much more than an exercise in accumulating stuff for the parts box.

Thanks all for your information. I got this as a late Christmas gift and the person who bought it for me really didn't know what they where getting. You are all correct, it is a handgun scope, I looked it up online from the company who made it and in there description it is a handgun scope and not designed for a AR 15 mount.
I have tried to mount it in the normal fashion with about 3-4" of eye relief and it is way to small, the cross hairs and blurry. I know this is not what I was looking at for my sport rifle, it was a gift. If it was the other model that has standard eye relief not the extended eye relief it would work great,
I am going to contact the company and see if I can exchange it for something else that will work correctly. Thanks to all that replied and all the great information.
I discovered that they have the same scope but without the long eye relief, this one's eye relief is 2"-4" not that 8.7"-10"+ eye relief I got. I hope they will exchange this out for me if not I will go directly thought the company not the distributor.

Got a pic? Model? Manufacturer?

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Sounds like you're on the right track.

I've tried to force things to work and when I was finished I usually wished I'd never begun.

Good luck.

Here is what I got: I know it's not a high dollar scope but this is what a friend of mine got me for a late gift.
Ultimate Arms Gear Tactical 2-7x32 Long Eye Relief Scout Rifle Pistol Scope Kit With Included 7/8" Weaver-Picatinny Scope Rings+ See Through Lens Covers+Lens Cleaning Kit
'UAG-2-7x32LE+Rings-S6''
MAGNIFICATION-2x-7x ADJUSTABLE
OBJECTIVE DIAMETER- 32mm TUBE DIAMETER. : 1"
FIELD OF VIEW @ 100 YRS ( FEET ) : 14-4.5 /// CLICK VALUE@100 YARDS-1/4"
LONG EYE RELIEF ( INCH ) : 8.7-10.65
EXIT PUPIL ( MM ) : 16-4.6

Attached Images

scope 1.jpg (4.0 KB, 10 views)

This is the other one like it.
''UAG-2-7x32NE+Rings-S4''
Ultimate Arms Gear Tactical 2-7x32 Rifle Duplex Sniper Reticle Scope Kit With Included 7/8" Weaver-Picatinny Scope Rings+ See Through Lens Covers+Lens Cleaning Kit

MAGNIFICATION-2x-7x ADJUSTABLE
OBJECTIVE DIAMETER- 32mm TUBE DIAMETER. : 1"
FIELD OF VIEW @ 100 YRS ( FEET ) : 36.6-13.6 /// CLICK VALUE@100 YARDS-1/4"
EYE RELIEF ( INCH ) : 2.56-2.95
EXIT PUPIL ( MM ) : 13.3-4.4

Attached Images

scope3.jpg (4.5 KB, 6 views)

It's not a bad looking scope really, but it's one of those $40-$50 dollar range scopes. I was happy to receive it, free optics hell yes. But when I looked them up I could see the big difference on there website between the too scopes eye relief. I needed the S4 not the S6 model, I am not sure if he or the distributor he got it from made the mistake.

As Rastoff said, so called 'scout rifle' scopes are intended to be mounted forward of the receiver. Google 'Ruger Gunsite Scout' and look at the images and you'll get the gist of it. Since you have the scope and the riser go ahead and mount it to the handguard and give it a try. It could work just fine, plus you'll get some rounds downrange.

I, and others here, speaking from experience, suspect that whether you span the receiver and the HG or mount it straight to the HG, the platform will have a tendency to move the zero. That's why I said earlier "...outside of 50 yds." It may work fine for close quarters blasting.

If they do swap the scope out for the lesser eye relief model I would suggest you still invest in rings designed for the AR platform. I prefer the one piece mounts like I showed in my above post. They will raise the scope up enough to where the front sight post will blur completely out at higher magnification.

$40 scope and ring package. If you get it swapped out, maybe put it on a .22 or something. With your AR, I wouldn't be surprised if you go through more than $40 of ammo at the range just to find out you don't like it or it breaks.

This is the scout rifle type mount the gentlemen are speaking of. Note the forward mounted rail.


Mounting a scope designed for this particular type of rifle on one with an over the receiver rail, won't give you the eye relief you need.

Always best to "use the right tool for the job at hand".

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Yes I knew it wasn't a high dollar scope but it was a gift and I cannot just put it down when a friend tried to get me something. I have had my eyes on some Primary Arms optics. I did get in touch with the company and they I guess are either refunding me the $40 bucks or sending me there S4 model, without the long eye relief.
I will still use it this spring if they don't refund me the money. I will post on here how it performs. I will not waste that much ammo sighting it in, no more than 20 rounds, only took 5 rounds to sight in my BSA RD30 red dot, but since I took it off and fiddled with that first scope I bet I will have to make sure its on still.