Description
Iron sights still earn their spot on a modern AR build, and the UTG Low Profile Flip-Up Rear Sight is a solid way to cover your bases without spending big. It rides flat and out of the way when you're running a red dot or scope, then flips up when you need a backup or want to go irons-only. The whole thing is machined from aircraft-grade aluminum with a black anodized finish, so it's a real step up in toughness over the polymer flip-ups floating around at this price.
What the Dual Aperture Setup Buys You
The MNT-955 uses two apertures instead of one. The larger opening is your friend for fast, close-range target acquisition where speed beats precision, and the smaller aperture tightens things up for deliberate shots at distance. Flipping between them is quick, and it gives you flexibility without adding parts or complication to your rifle.
How the UTG Flip-Up Rear Sight Locks In
Deployment runs off a spring-loaded Posi-lock design with a side plunger release. Push the sight tower up and it locks upright with a ball-bearing detent, and to fold it back down you just compress the plunger. That lockup is what keeps your zero holding between range trips. Worth noting, this sight does not auto-pop when you hit the button, you raise the tower by hand, which plenty of folks actually prefer since there's nothing to accidentally trigger.
Mounting and Fit
Installation is about as simple as it gets. A low-profile 3mm locking bolt and mounting deck clamp the sight down onto any standard Picatinny rail, so it works on AR-15 uppers and other long guns with rail real estate. UTG designed it to sit on the same plane as their matching front sight, so pairing the two gives you a clean, co-witnessed iron setup. UTG suggests torquing the side plate screw to around 25 inch-pounds to keep everything snug. For a lightweight, no-drama backup or primary rear sight, this one punches above its weight.
Key Specifications
- Manufacturer: Leapers UTG
- Manufacturer Part Number: MNT-955
- UPC: 4712274528390
- Sight Type: Flip-Up Rear (BUIS)
- Aperture: Dual Aiming Aperture (small and large)
- Material: Aircraft-Grade Aluminum
- Finish: Black Anodized
- Locking System: Spring-Loaded Posi-Lock with Side Plunger Release
- Mount: 3mm Low Profile Locking Bolt, Picatinny/Weaver
- Platform: AR-15 and Picatinny-Equipped Long Guns
- Color: Black
- Style: Flip Up
What’s Included
- UTG Low Profile Flip-Up Rear Sight (MNT-955)
Frequently Asked Questions
Does the UTG flip-up rear sight pop up on its own or do you raise it by hand?
You raise the sight tower up by hand, and it locks into the upright position with the spring-loaded Posi-lock detent. It does not spring up automatically when you press the plunger. Many users like this since there's nothing to accidentally deploy while the rifle is stowed or slung.
Will this rear sight co-witness with a matching front sight?
Yes. UTG designed the MNT-955 to sit on the same plane as their matching flip-up front sight, so pairing the two gives you a proper co-witnessed iron sight setup. It works well as either a backup behind an optic or as a primary rear sight.
What's the difference between the two apertures?
The larger aperture is meant for fast, close-range target acquisition where you want a wide, quick sight picture. The smaller aperture tightens your view for more precise shots at longer distances. You flip between them depending on the situation.
Does the UTG flip-up rear sight fit any AR-15?
It mounts to any standard Picatinny or Weaver rail using the low-profile 3mm locking bolt and mounting deck, so it fits AR-15 uppers and other long guns with rail space. UTG recommends torquing the side plate screw to about 25 inch-pounds for a secure hold. Setup takes just a few minutes with basic tools.







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