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Posted: 5/26/2008 5:50:06 AM EDT
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I'm trying to find out if I were to mount a scope on my rifle which has a continuous top rail to it; would it affect the zero of the scope if I mounted it slightly past the top of the upper receiver onto the rail/barrel portion. I have included a picture of my rifle linked from Smith and Wesson. I am looking to get 2 piece rings for now, and I wanted to make sure if I needed extra eye relief I could mount it on the free float rail portion. Any thoughts if this setup pose a problem. http://www.smith-wesson.com/wcsstore/SmWesson/upload/images/firearms/811001_large.jpghttp://www.warnescopemounts.com/magnum_rings_files/706_0652.png Just in case the question comes up, I am looking at Warne rings which are the AR-15 Ultra High, with quick release leavers. I want these to be able to remove the scope quickly at the range without tools if I choose to shoot BUIS for the heck of it. Then put the scope back on and still have zero. I never see anyone do this in their pictures they post, and this is why I ask the question. Would this be a no-no if your trying to keep your zero. Thanks!! |
| Changing to a different slot NOT on the front rail will change your zero. Mounting on the FF rail is genrally considered a non-no by purists but it CAN work. It can also bind your scope and cause premature failure or other issues. As always I reccomend the Larue mount to get the cantilever you need and if not, due to price, then the Armalite scope mount so you can stay on the upper receiver and move the scope forward. |
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The closer you can get the front ring to the barrel nut, the better it will be, but many railed handguards are slightly off from the plane of the flat top, and it doesn't take much to stress the tube and shift your zero. An extended one-piece mount is definitely better, though bridging the rails work for some, as said. Depending on your scope, the Armalite may not work with your BUIS, as it's one of the lower one-piece mounts, with a 1.25" centerline. Not many BUIS will fit under a typical magnified optic with this mount. It's the best made of the under $100 mounts, IMO. If your budget allows more, the LaRue, ADM, or GG&G QR mounts are all good. You can tell like this: Measure your eyepiece diameter, with any flip caps. Divide this by 2. Add that to the height of your BUIS. This gives you the lowest mount or ring centerline that your BUIS will fit under. Here are some popular BUIS heights: ARMS 40 - 0.950" folded (mine is 1.00" even) YHM-9680 - 0.840" folded (mine is 0.850") Matech - 0.75" folded MI ERS - 0.750" folded GG&G MAD - 0.625" folded ARMS 40L - 0.610" folded Troy - 0.460" folded MI MCTAR-SPLP - .4375" folded KAC 300m - 0.315" folded Here's the Big List of AR15 one-piece mounts: www.maxicon.com/guns/optics/one_piece/ar15_onepiece_mounts.htm |
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Right now I am on a budget. I mainly want something else other than the BUIS to shoot at the range with. So for now I am going to stick with something cost effective. I have picked out a fairly inexpensive scope, as well as those rings I posted above. The total setup would cost me around 250.00 with shipping. The Larue mount is wonderful, and I have done plenty of research on the mount, but the mount alone is 195.00. Which is a bit outside my budget. Plus, I am range shooting. I don't need the best to shoot at paper. I am sure I will still maintain a fairly close group at 100yd. I am mainly polling people to see if they have mounted their scopes like this before with a 2 ring system and have run into any problems. I can speculate all day long that the scope will run into issues over time, but I am assuming the design of a gun with a running rail like this is meant to house a scope system past the standard upper receiver. Thanks for who have replied. Any other thoughts, or hands on experience with this setup? |
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