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Posted: 3/26/2008 1:10:02 PM EDT
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I just received my M&P15 a few days ago. I want to mount a scope on it, already purchased the scope and mounting rings. I believe the rifle is a M&P15A as that appears on one receipt. It is the flat top with no carry handle. I got the battle sights zeroed, but when I tried to mount the scope the rear sight had to be removed because the mounting rings were too short, and I had already gotten the "high rise" version. I found some "risers" listed in a Bushmaster catalogue, but am wondering if there is a better way, or place, to get them. I did mount the scope by taking off the rear sight. THen when I looked thru the scope I got a nice view of the front sight. The cross hairs are about half way up the front sight. I figure I will have to raise the scope mount by about an inch to have both scope and battle sights on the rifle at the same time. Any/all hints are appreciated. BTW: This is my first excursion into the AR15 world. I got out of service just at they were coming into place. Thanks, Elk |
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The line of sight of the iron sights on an AR is normally 1.4" above rail. Ultra high ring mounts (at least those from Leupold) also have their centerline at 1.4" above the rail. Other mount mfgrs may define their scope heights differently. Anyway, I have a Leupold 3-9x on these mounts, and the front sight is invisible, even at 3X. There is room under the aft end of the scope, for an ARM40L (folded down), although I don't have one mounted. What scope are you mounting? At magnifications greater than 3X, the front sight should be invisible. If the magnification is less than that, then the front sight will be visible. You will have to go higher than 1.4" with the combined height of the rings and riser, if you have to clear the front sight with the cross hairs of your scope. I have been told (in this forum), and I believe, that you can't "co-wittness" a magnifying optic and BUIS, for whatever that's worth, if that's your intent. Good luck. Figuring this stuff out half the fun. |
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I am using a 3X9, 40 mm objective lens. I want to leave the fold down sights on it in case I have to remove the scope and still shoot. Other than that I will probably never use the battle sights again. Just like to be prepared for all eventualities. Thanks for the info. I will probably just go ahead and order up the risers. Each one of them adds 1/2 inch of height, so I figure if I add two under each ring I will be in good shape. That will cost me about 65 bucks, but given the overall price of the package, that isn't too bad. Can't wait to get the scope mounted and zeroed. Now all I need is a good place for some less expensive ammo. Thanks for the info. Elk |
| There some drawback in "stacking" risers as each individual riser is one more interface that can loosen up and destroy your scope zero. My Leopold scope is also 3X9X40mm and it would just barely clear the folded ARM40 rear sight, so it sounds like you'll need at least 1.4" elevation off of the rail. Given that you're going to carry the BUIS, I'd consider one of the riser configurations with a single throw lever, so the whole scope/mount assembly can be quickly removed without any tools. Larue is the gold standard (I guess) but expensive, and there are others like GG&G which aren't quite as prestigeous but appear to be as functional. You might want to check out MidwayUSA as they offer a zillion mount/riser combinations and their on-line catalog presents them well. |
I agree for the most part. I have two MP15s: one with TA11 mounted to the carry handle (MP15) and the second with a Larue mount and an Accupoint 2.5X10X56 (MP15T). After purchasing my Larue mount, I was able to finally come to grips with my long standing hatred of individual scope rings. By year end, I will migrate the Super Snipers on my M1A and Rem700 to Larue mounts. I will also have configured my Colt Ar15 to Larue/Accupoint combo. It is a false economy not to buy Larue in my mind - that is some pretty tasty kool-aid! |
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