November 14, 2012, 02:06 PM | #1 |
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MBUS
Is the polymer rear MBUS worth considering as a main backup sight over an A2 handle? Is this rear sight tight and will it hold zero... I mean really hold zero like no movement shows up at 100 yards?
I'm in a predicament where having a slim BUIS under my ocular is pointless because the Nikon 223 cantilever scope mount will not tip off... only slide off. -SS- |
November 14, 2012, 02:20 PM | #2 |
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As a backup sight, they are fine. They are actually proved to be tougher than Troy and some other more expensive steel BUIS in some drop/impact testing that I saw.
That being said, I wouldn't want one as a primary sight. The aperture doesn't work for me well and they do flex a little bit. Troy BUIS are the lowest that I have used, they will normally fit under pretty much any optic that is mounted to the correct height. Of course, unless you have Quick Disconnect scope base, it is kind of pointless to use BUIS. If you are going to have to use tools to get the optic off, you will have time to put the carry handle back on. What type of base do you have that requires you to slide it off the back? Are you sure you can't just turn the screws a little farther and take it straight off?
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November 14, 2012, 04:45 PM | #3 | |
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I have MBUSs on several of my ARs, many without optics and I've never had an issue with the zero on them.
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November 14, 2012, 05:04 PM | #4 |
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The scope base is the M223 it is a one piece slide on base specific for flat tops. It actually means it also comes right back to zero when removed and replaced, but with the downside that it doesn't tip off. I guess it's for a varminter style AR.
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November 14, 2012, 05:08 PM | #5 |
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You sure you can't just loosen up the screws on the side to the point that you can get the metal that holds it down passed the edge of the rail and just lift it off?
I have never seen a Weaver/Picatinny rail that you couldn't. How did they get the nuts on there? Normally you can actually take nuts off the threads. (The way they were assembled) ETA: Looking at the pictures, you should be able to just unscrew the allen bolts from the base and take the side piece off and take the scope right straight off. I know this can be done with the Armalite, UTG and Burris PEPR mounts (I have them), I would be suprised if it didn't work on the Nikon. I would hate for you to spend money to fix a problem you might not have.
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November 14, 2012, 05:50 PM | #6 |
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@Crow Hunter... it's the M223 with only two bolts and is a single piece unit. It doesn't have a side clamp. Attached...
Maybe I should replace the mount. -SS- Last edited by Sweet Shooter; December 18, 2014 at 06:09 PM. |
November 14, 2012, 06:55 PM | #7 |
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Are you sure you can't back those 2 allen bolts out far enough/all the way out to the point you could get that side plate off or back far enough to just lift it right off from the top?
They had to assemble it originally and I can't think of a way you could put allen bolts in to where you couldn't get them back out. I have never owned a Nikon M-223 mount before so I don't know for sure. But all the others that I have owned in the same price range and even lower, you could get them off. Now if it doesn't use the piece where the allen bolts go through to clamp onto the rail, I am at a loss. How does it lock onto the rail?
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November 14, 2012, 07:15 PM | #8 | |
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But my Q now is do I stay with the A2 handle or go with the MBUS? Neither will be able to stay in place with the scope on, or when I wish to swap to irons. Unless I change the mount. -SS- |
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November 14, 2012, 07:27 PM | #9 |
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Your mount doesn't come apart like this Nikon M-223 mount?
http://www.youtube.com/watch?v=5tJqvx9byz0 I am surprised if it doesn't. I thought that was how pretty much every Weaver/Picatinny mount worked and it would be odd that Nikon had 2 different designs. 2 screw vs 3 screw. Odd. I think I would just get another scope mount before I would start swapping BUIS. You can get a Burris PEPR mount (I just got one from SWFA) for $69.99 and you CAN take those off.
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November 14, 2012, 07:35 PM | #11 |
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I can't really tell from the picture. It looks the same as the 3 screw model to me.
Its odd to me they would have swapped designs like that between the 2 and 3 screws. Kind of sounds like they are "claw" type mounts like you use on a grooved .22 receiver. I think I would swap out to a different scope base myself.
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November 14, 2012, 07:42 PM | #12 |
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Ah. I see now. Thanks for the video.
That is annoying. I almost grabbed one of these when I picked up my last M&P15-22. I am glad I didn't now. I don' like that at all. I would definitely swap to a new base. Unless you could drag it off the front and get it off. I would rather have something that had levers or at least thumbscrews that I could take off without tools so I could use the BUIS. (I prefer Larue myself, but they are pricey) To your original question. I would try to look through a MBUS before you buy. The sight picture isn't "clean" to me and I don't like them personally. But for BU sights, it might not really matter.
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November 14, 2012, 07:53 PM | #13 |
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I'm a big fan of MBUS. I really like their redesign that has the dual aperture.
Video showing the dual aperture http://www.youtube.com/watch?v=1C_AzdefkTM |
November 15, 2012, 12:31 AM | #14 | ||
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That said, I own both. The MBUS sights are great back-up sights, but the Troys are clearly superior, if only for the vastly better sight picture. The chunky squarish rear aperture of the MBUS really wrecks the sight picture, compared with the crisp and clean Troys, which are truly good enough to be used as primary sights. Quote:
Last edited by Fishbed77; November 16, 2012 at 12:30 AM. |
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November 15, 2012, 07:22 AM | #15 | |
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One would think that a person making a youtube vid about a scope mount would know the difference between 1 inch and 30 millimeters, and that a Picitinny rail and 1913 rail are one in the same. The OP's mount is best used with airsoft. There are several tilt off mounts that cost the same or less than that Nikon, and are better quality. QD's are best but thumb screws well do. |
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November 15, 2012, 11:13 AM | #16 | |
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November 15, 2012, 02:17 PM | #17 |
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I now have three rear MBUS gen 2 sights and am happy with all of them. I did get one that was defective (the hold down detent was cut wrong) but Cabelas made a quick swap with a good one.
I saw a torture test (probably the same one Crow Hunter mentioned) and the MBUS survived multiple 5' drop tests right on the extended sight with less than a 1 MOA loss of zero while Troy and Diamond were bent and had 3-5 times more loss of zero. |
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