These BUIS (Back-Up Iron Sights) from UTG are able to fold out of the way like no one’s business. They also have nice, high quality machining despite a low cost. But, there is one thing that has always worried me about this set of iron sights and that is the locking mechanism. It seems very vulnerable.
First, I’ll talk about sight picture. This set of sights, which is made up of model numbers MNT-755 and MNT-955, has a similar sight picture to the AR-15/M4/M16. With that being said, I don’t think these sights have a great sight picture. My primary complaint is that the rear aperture is a circle that is cut into a “rectangular object” (I couldn’t think of a better word to use here). This means that the rear aperture has an inconsistent amount of material encircling it. This makes the already incoherent geometry style of these sights even worse. I for one, just don’t like this style of sight geometry. I just don’t feel as fast or as confident as I would when I’m using HK-style iron sights.
Onto the next topic; adjustability! The front sight has a Mil-Spec A2 front post making it elevation/gravity adjustable with the use of a front sight tool. You do get a lot of adjustment out of the A2 front post since it is so tall. There are also many aftermarket options if you want to change the front post out for something more precise or night-time capable. The rear sight is adjustable for windage without the use of a tool. Also, the rear aperture has two settings. A small aperture, for long distance/day time shooting. And, a large aperture for short distance/low light shooting.
We are now onto construction and size. The MNT-755 and MNT-955 are almost entirely made out of anodized aluminum. The parts that are steel include any screws, plungers, pivot pins, springs, roll pins, and the front sight post. This nets these BUIS’s with a combined weight of 2.93oz. The front sight/MNT-755 weighs 1.4oz. and the rear sight/MNT-955 weighs 1.54oz. These sights sit really low with a peak folded height of 0.55″ (front sight) and 0.56″ (rear sight). Lastly, the front and rear sights have a folded length of 2.3″ and 2.4″, respectively.
Whoops… I almost forget to talk about the locking mechanism that I complained about earlier. It’s kind of hard to explain, so I’ll just put it this way. My problem with these things is that the steel plunger mechanism that keeps these sights locked in the up position wasn’t designed correctly. Things just aren’t sized and positioned appropriately. There is excess wear and grittiness going on when they are folded or deploy. I haven’t even used them that much over the two years that I have owned them.
Thanks for reading this article. I put time into making sure that it was well constructed. If you have any questions, comments, or criticisms then do not hesitate to post them down below. I will try to answer any questions as soon as I can.
If you enjoy my articles, wish to see more content of its kind, and you are wanting to buy the product mentioned in this article then please click the link(s) below to be directed to a website to purchase it. Using these links will not add any extra costs to the purchase. It merely tells the selected merchant site that ArmThyselves.com directed you to them which will ultimately grant me a small kickback for my efforts.