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Posted: 5/16/2015 7:28:57 PM EDT
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Hi everyone,I am building my first AR 15, it is a Flat top, Mid length, Rifle in 5.56×45mm NATO and am going to us a Rail Riser to bring scope mount up and back some. My question is ,when putting a prismatic scope on a flat top AR 15 in 5.56×45mm NATO, and using a riser that has different MOA's ,does MOA setting depend on Scope or bullet caliber, bullet weight or what. ??? I have never used a Riser for a Scope Mount, any help would be greatly appreciated.
This is the Riser I am considering, http://www.mountsplus.com/AR-15_Accessories/AR-15_Scope_Rings/MOA-SET-T.html Thanks,Cotton |
That is the amount of cant built into the mount. It really depends on the total amount of elevation travel in the optic and how far you want to shoot. For example, assume that your scope has 60 MOA total travel. You would want the 30 MOA base to get the full travel in the turret. Most scopes will be set about the halfway point in their range of elevation. Using a canted base moves the reticle to the end of the travel allowing you to be able to "dial" the entire amount available instead of roughly half. This isn't really needed if you plan to zero it and not touch the adjustments again. Clear as mud? I have a hard time explaining stuff sometimes. 
ARMS mounts aren't that great. They will work, but there are much better out there Bobro, ADM, and LaRue come to mind. |
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What prismatic scope? I can't imagine that you would need a MOA riser with it. Get a zero MOA. It's not like you'll be trying to shoot to 1,000 yards.
The scope configuration determines the mount. BTW: ARMS would be pretty low on my list. If you actually need that kind of mount for a prismatic optic, you should consider LaRue, ADM or Bobro. |
| Thanks guys for the info ,I guess I just need a straight 0 degree riser that will move the scope back some. found this one ...AR-15 Picatinny Cantilever Mount .75" Riser 12 Slots 12 Slots 2.75" Overhang 5" http://www.cheaperthandirt.com/product/ARR-2421 (simple enough). |
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I would recommend a one piece cantilever mount. You've gone from an unreliable, yet pricy $170 QD base that still needs separate rings to a cheap fixed base at $11.00, that still needs rings and has screws that will strip out when tightend.
Maybe spend some time looking at photos of scoped rifles here to see what most people are using? You will not likely see much support for your approach. If you are on a budget and want a fixed cantilever combo of rings and base, there are quite a few Nikon two piece P mounts being used here. About $50. For something better made and strong, the $100 Leupold one piece cantilever Mark 2 IMS works well. Good QD one piece cantilever mounts include the ADM Recon, about $170, and my favorite, the LaRue LT-104 at about $200. All of these also take the guesswork out of getting base and ring height right, which needs to be 1.4"-1.5" from top of rail to centerline of the scope to match the height of your AR stock. You still have not told us what optic you are trying to mount. There are different diameter main tubes and different lengths between the eyepiece and turret and turret to front objective bell that affect mounting options. |
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