MBUS Flip-Up Backup Sights, Black, Rear Sight

I've been running Troy Micro flip sights on my other rifle for about a year now. While certainly fantastic sights, there are two major drawbacks - one: you have to manually flip the sights up by pulling on them, and two: The sight will not fold down correctly if you prefer using the small aperture - the large aperture is in place by default. So when I bought my second AR, a Sig M400 Enhanced, it came with a less-than-stellar rear flip sight that had the same basic functionality of the Troy, but without the button lock. Being that I didn't plan on mounting an optic any time soon, I realized the need for a quick deploy rear sight. That's why I purchased the Magpul Gen 2 MBUS rear sight - and for my usage - it's absolutely perfect. Everything about the sight screams quality. It's quite heavy for polymer, which I wasn't expecting, but still shaved some weight off of my AR (all Magpul MOE furniture to keep it light). It pops up quickly when needed and tuck away quickly when I don't, were zeroed in with my standard A2 front post sight when I received them, and look fantastic on my rifle. I had used and abused a first gen set on a different rifle and they never let me down, so I don't expect this one to either. Magpul is a company known for constantly striving to improve and perfect their products. Don't listen to any naysayers about it being a "cheapo plastic sight" - These things are built like a tank and I actually prefer mine to the Troys I have on my primary rifle. If you need a flip up rear sight and are considering buying this - just do it - if you don't like it - return it or sell it on Ebay for a minimal loss.

I love this sight to death. It's so tight to put on the rail I had to apply lube to the rail itself, tight tolerances are a good sign of quality manufacture. Feels solid, not flimsy or wobbly. Spring retention ensures that after each shot it returns to zero. Also, the square top of the sighting ring makes obtaining accurate aim faster. I have an A3 type rifle, and the standard A2 front sight with it's dog ears protecting the front sight blade: point directly to the squared edges of this rear sight's peep ring. Which actually makes acquiring the target seem easier and faster than if it were a perfect circle rear sight ring. Maybe it's psycho somatic where it's purely me, but it quite honestly seems faster on target than metallic orb rear peeps. the square top of the sight ring, purely objectively to me at least, seems to aid in my finding the center with the front sight blade because the dog ears protecting the blade have an extra frame of reference by branching off towards the square radii left and right of the rear peep. Could be my imagination: but I love this thing. It's solid, tight, retains zero, folds -REALLY- low (which is great) and what I like most: super light weight. I don't like quad rails and hanging off 5 pounds of junk on my rifles. I don't put anything on one of my rifles unless the added capability the accessory brings justifies the weight it brings. I like an Ar-15 carbine to be light and fast, transition target to target quickly. I wouldn't hesitate to put one of these on any pic rail that needs a backup rear. Be it a full fledged A3/A4 combat rifle or a $5k race gun that has to have a rear sight to qualify for a division or specific course of fire. Fits tight, holds zero and weighs next to nothing: you can't go wrong with one of these. I have -NOT- had hands on experience with the mbus II FRONT sight, only the rear: so I cannot offer an informed opinion about the mbus front sight. I can say with relative confidence, I have a high opinion of magpul products in general and if the front sight is of equal quality to their rear sight - I wouldn't hesitate to use that either. I cannot however, give first hand account of what the front sight is like. I can say that -MY- mbus II rear sight is terrific, and that it's my go to choice for any pici-rail gun platform that's in need of a backup rear.

These sights are wonderful, some people say Troy are better and I do not disagree that troy are quality back up sights. But magpul are cost effective and in a drop test they seemed more durable than Diamondhead/Troy. Not only did they retain zero better than the others, but they seemed to handle impact better than metal. Taken from an article on KitUp "In order to test whether certain popular BUIS would still be serviceable after taking a hard hit, I attached three different types of BUIS - Troy Industries, Magpul Industries and Diamondhead USA - to an AR-15 rifle chambered in .300 AAC Blackout weighing 7 pounds and dropped the rifle upside down from a height of 5 feet onto a concrete surface. Other portions of the rifle were protected from damage, and each set of BUIS took a solid hit from the drop. The ammunition used was Remington Premier Match .300 AAC Blackout 125 gr OTM. Each sighting device was installed according to the manufacturer's instructions, then points of impact was established from a stable shooting position at 25 and 200 yards. After the drop, the rifle was fired again, and any change in point of impact noted. The first BUIS dropped was the Diamondhead. At first, damage appeared cosmetic only; however, the apertures could no longer be rotated, windage could not be adjusted, and there was a definite cant to the BUIS. Point of impact shifted approximately 16 MOA. We contacted Diamondhead with this result. They replied that a newer version was available which was more durable. We offered to test the new model but production issues meant they could not ship one to us. Next came the Troy sight. Cosmetic damage was apparent, but the sight could still be operated normally. Point of impact shift was approximately 3 MOA. The last set of BUIS was the Magpul MBUS. Damage was purely cosmetic and the sight remained fully functional. Point of impact shift was less than 1 MOA. Unlike the other sighting devices, a second drop was performed. Results did not change, and the sight remained functional." Now my personal experience with these is on my M&P15-22 but I'm ordering an additional MBUS for the AR I am building. They are really good quality, just make sure you don't get a PTS sight from a bad retailer.

Like almost everything Magpul makes, this is a great product, especially for its cost. I do not think it is the best BUIS available for purchase, however, I think it is by far the best available for the cost ($55). I have owned and used cheap $25 UTG back up rear sights and I have owned and used $125 Troy rear BUIS. The Troy sight that I have mounted on my M&P is better than the magpul because it has a more precise feeling adjustment (very tactile feeling clicks for adjustment). The magpul has held zero very well and adjustment is easy and fairly precise (a little more play between clicks). It took a while for me to figure out how to work them, but this sight does have dual apertures, though in my opinion it would not have mattered if it did not because I use the sight strictly to back up the vortex sparc (which has also surpassed my expectations) mounted on this rifle. The dual aperture mechanism seems a little flimsy because they "sandwich" together instead of being able to flip from one aperture to the other like most iron sights. I have found no problem thus far, but the way they click together could become problematic. That is just my opinion and for others information to point out that it is not the traditional dual aperture used in a carry handle or 95% of other AR back up sights. My notions of future problems obviously didn't effect my 5 star rating. If it were my only sight on the weapon, I would probably spring for a better sight, but I purposely bought a less expensive sight for a gun that I was not intending to drop a lot of cash into. I love the spring deployment feature as well. It is also very sturdy, unlike the old UTG sight that I had (after about 6 months it wouldn't stay in the "up" position). If you are even considering a cheaper folding rear sight (i.e. UTG, NC Star, etc.), go ahead and save up for this one. You won't be sorry.

These were the gold standard of back up iron sights (BUIS) for a long while. They were recently replace with the mbus 3 from magpul. However they are still a nice reliable and dependable back up flip up sight. I used these for years and never had any issues with any of the ones i owned. Great value for the price, and would recommend these if you don't like the new model. They are nice and pretty thin so they lay flat under optics and dont stick up too much when folded down.

Listen, a lot of guys will whine and say that the mbus sight is not the best choice for a folding back up AR sight, claiming that there are far better designs out there that beat the Magpul. I agree that it is not a Troy, but it sure is a lot cheaper, and when you look at it with value for the money in mind, it wins. I recently saw an online torture test of a bunch of folding back up sights and the mbus won over the Troy and some other high dollar sights because it held zero better and did not break after being attached to a rifle and then dropped sight first onto concrete! The polymer design is the same high quality type used to make Glocks, and we all know how serious their reputation is for durability and quality. Magpul makes great stuff and they understand today's average consumer is not made of money either, so they worked out a great balance between reliability, quality, and affordability. I like the apertures as the sizes are perfect. The smaller aperture is a good all around diameter and the larger seems good for close quarters combat or low light conditions. Sure the mbus rear sight is only windage adjustable, but within around 200 meters, this will do the trick. From my memory, the Army standard is to zero iron sights at 25 yards for a usable battle setting out to 250 meters for 5.56. Remember that this is a fairly flat round in as the bullet drop factor is minimal at normal combat distances, actually average 55 grain ball rounds only drop around 9 inches at 200 yards. When you do want to reach out further than a few hundred meters you may want to be using a magnified optic anyway because of ease of adjustment and precise visibility. So just get one already, you won't regret it!

I'm starting to become a big fan of Magpul and its product line including its PMags, Hand-guard, and now their rear MBUS flip sight! This rear back-up sight is made of Polymer (fancy plastic) which makes it extremely lightweight yet durable! The build quality and Quality Control on Magpul products is superb and you can feel that when holding the product as well as with the price tag. The flip-up feature is a bit sticky sometimes but works real quick 98% of the time so be aware not to pinch your finger pushing on the top button! This is a great buy if you're looking for a low profile flip-up sight to put under/behind a scope or red dot sight! I leave this on my rifle all the time because it takes a flat head to remove and I just put my Vortex Strikefire red dot sight on or a magnifying scope for long distance that I can quick detach quickly and flip up the back up sight for close quarters. Currently I'm running the flip-up sight with my red dot and it's been working great at the range. I will say I noticed like a couple other reviewers that the apertures with the larger hole is a little bit too big and the smaller hole is somewhat too small in that the center while peering through has a blackish blur at times. Just a heads up for anyone who thinks the sight holes are exactly the same size as mil-spec AR carry handle sights.

This review is for the MBUS set (front & rear): They’re iron sights (made of polymer). They are, however, solid. No wiggling or anything. They are a bit tough to slide onto the rail to line up with a slot, but that is a plus IMHO. The rear sight doesn’t quite flip up consistently when pushed on either side, but using the center of the button solves the hesitation, and it works flawlessly. It springs up into position, but is hesitant in deployment, is probably a better way of putting it. The front sight flips up flawlessly no matter which side of the bar style lever (or button) you use (left, right, or center). I, personally, prefer metal sights. However, with the price vs quality factor/compromise taken into consideration, these are a solid choice and I do not regret this purchase. NB: It fits under my SigSauer Juliet 6, but the tolerance is paper thin between the rear protective cover (it slides off to access focus ring). Without the cover it’s got even more of a gap between the optic and rear sight in the folded position. But I prefer the cover on. These sights are mounted on a same-plane standard 1913 Picatinny rail.

First of all... the delivery took over a month... what is acceptable due to the corona crisis. But what I dont understand is, when I buy an iron sight for 60,00€, that the mounting screw to fix it on the picatinny rail is missing! The package looked original and unopened, but the screw and counter washer just weren't there! Its no so much of a deal cause already got a screw and a washer outa my stash and mounted it... but for this price I expect all parts included- also because it shows on amazon with the mounting screw and also in the instructions! It would have been nice to have all parts of this sight originally from MAGPUL as thats what I paid for!

物はマグプルでしかも実銃用なので信頼性はピカイチです。しかしながらカラーを間違って買ってしまいました。