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Can I double ring a scope behind the turret like this?

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Arizona_Mike

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5.7x28mm AR57 upper. There is room enough to slide the P90 magazine under the objective bell (even with a cover on) but any cantilever mount would interfere with the magazine. Recoil is negligible.

IMG_2731_crop_small.JPG


I sent an email to Nikon but no answer yet.

Mike
 
i don,t see why not, if the rings and base are tight. one way to make sure is to shoot it. eastbank
 
I bought a Winchester lever action 22 magnum that has a scope mounted like that. It is an old Tasco. I swore I was going to change it. Then I took it to shoot. Eye relief was perfect, the glass is clear, adjustments work, and it shoots great groups. I have not changed a thing.

I don't believe you will have a problem with normal use. It might not be a super durable setup for hard use.
 
I think it'll work, but it also appears you have room to move one ring in front of the turret and still maintain the same eye relief. At most you'd only need to move the scope a fraction of an inch rearward. I'd at least give that a try, of it doesn't work for you it could always go back to this.
 
Just from an aspect of leverage, I would be mildly concerned about possibly bumping the front of the scope and bending something out of whack. I think I would be more comfortable with a shorter scope if I were to do something like this...and possibly even use an extended ring on the front to give it more support. Just some thoughts....it might work just fine as is....
 
looks like a soup sandwich, but my guess is it will work ok with 5.7x28 given the low recoil
 
You can always get a cantilever mount and mount it backwards...
Click to expand...
Nope, that'd push the eyepiece closer to his eye, his problem is he needs to get it further from his eye.

Since its an AR5.7 using a cantilever as intended won't leave enough clearance to remove and replace the magazine.

I'd bet with the low recoil of the 5.7 round it just won't be an issue.
 
Maybe I misunderstand the question- I'm not overly familiar with AR style rifles- but why would you ever need to "slide a magazine under the objective bell" on any weapon?
 
A guy I work with and occasionally hunt once showed me his Savage 12 in 204 with a huge mueller scope mounted with both rings in front of the turret. Also the scope had a slight cant to the right. I shrugged it off as him not knowing what he was doing. That was until I watching him nail two groundhogs with it rested on a four wheeler rack at 405 and 385 yards. Needless to say if it works for you it works for you. Put the scope through the ringer of test and see if it passes.


Sent from my iPhone using Tapatalk
 
newfalguy101 said:
Because on the 5.7AR upper the magazine sits on top of the barrel just like it does on the p-90
Click to expand...
This worked fine for the mag but I had to pull my head back a bit at 7x and uncomfortably so at 2x. You can see how there is absolutely no room for any kind of cantilever mount .

AR57_2.JPG


The difference is about 1.3"

Ballisticly a rimfire scope is a great match. However, the Nikon has an absurd amount of eye relief for a rimfire scope. A little less eye relief and a shorter distance from turret to eyepiece (totalling about 2") would work great.

Mike
 
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Also the scope had a slight cant to the right. I shrugged it off as him not knowing what he was doing
Click to expand...

There is a school of thought that canting the sights or a scope can be beneficial as tilting the rifle inward to compensate and make the sights vertical brings the gun to your cheek with your head straight up (or nearly so).

As my osteoarthritis worsens and tilting my head becomes less than pleasant, I may be giving this a try in the not too distant future -- will likely fubar the gun for use by anyone else as the "correct" tilt for me is not likely to be correct for them and it'll just be "goofy".
 
i don't have any better ideas but would be interested if you get it to work. despite the outrageous high price of that ammo and difficulty reloading, I always liked the concept. I sold my USG and IOM and PS90 because I couldn't work the crappy bullpup trigger fast enough on the PS90.... but with an AR, seems like it would be a lot of fun. basically like a reliable, slightly hotter 22LR.

maybe consider going to a red dot with a magnifier in the back? only gets you to 3x instead of 7x though. or maybe an acog?
 
taliv said:
i don't have any better ideas but would be interested if you get it to work. despite the outrageous high price of that ammo and difficulty reloading, I always liked the concept. I sold my USG and IOM and PS90 because I couldn't work the crappy bullpup trigger fast enough on the PS90.... but with an AR, seems like it would be a lot of fun. basically like a reliable, slightly hotter 22LR.

maybe consider going to a red dot with a magnifier in the back? only gets you to 3x instead of 7x though. or maybe an acog?
Click to expand...
If by slightly hotter you mean 3X the muzzle energy and a 45% higher BC I agree :D

It is a very misunderstood round little round. Actually between the .22 Winchester Mag and .22 Hornet in muzzle energy (and designed around long high BS bullets).

CCI-Mini Mag: 40gr, 0.138 BC, 1235 fps (published rifle velocity--about 1200 for a 16" barrel)
SS192sr: 40gr, 0.200 BC, 2150 fps (16" bbl)

I should be getting at least 1900 fps with my 6" barrel (even before silencer boost).

I picked up 1000 rd for less than $0.36/rd. Not bad for rounds loaded with V-Max bullets.

I am seriously considering this prism scope because it has a very low mounting option (that removable center section lowers the scope by 0.34" which almost makes up for the receiver being 0.45" taller): http://www.primaryarms.com/primary-...nted-762x39300bo-acss-reticle/p/pac3xak300bo/ If I don't like it for this gun, I'll use it on my 300 BO upper.

Mike
 
-I'd need a 1/2" cheek rest.
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Yea, I mounted a red dot on one and found that out. What about the Nikon P-223 3X scope on rings? It is short and doesn't have to be mounted far forward. Imagine it without the riser it is on in the pic.
 

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