When you’re building a dependable AR setup, backup iron sights aren’t an afterthought—they’re insurance. The Leapers, Inc. UTG Accu-Sync® Spring-loaded AR15 Flip-up Rear Sight (MNT-957) is designed to deliver fast deployment, solid lockup, and repeatable performance on any MIL-STD-1913 Picatinny rail. Finished in matte black and built for modern rifles, this spring-loaded flip-up rear sight gives you a rugged, low-profile aiming solution that’s ready the moment you need it—whether you’re running a red dot, LPVO, or simply want a reliable rear iron as part of your primary sighting system. leapers.com+2OpticsPlanet+2
Built for Speed: Spring-loaded Deployment + Posi-lock Push Button
The defining feature of the UTG Accu-Sync rear sight is its spring-loaded, push-button activation. Press the Posi-lock button and the sight tower automatically deploys, giving you quick access to irons when seconds matter. Just as important, the mechanism is designed to prevent the sight from collapsing when deployed, so it stays up and usable under recoil and hard use. OpticsPlanet+2joeboboutfitters.com+2
This is exactly what shooters want from a flip-up rear BUIS:
Precision Machined for Durability: Aircraft-grade Aluminum Construction
A backup sight has to be more than “good enough.” UTG machines the Accu-Sync rear sight from aircraft-grade aluminum and gives it a matte black finish for a subdued, non-reflective look that fits duty, range, and field rifles alike. The result is a rear sight that feels sturdy without adding unnecessary bulk. OpticsPlanet+1
Dual Apertures for Practical Shooting
This rear sight features dual apertures, allowing you to choose an aperture size that matches your situation—whether you’re prioritizing speed up close or precision at distance. It’s a classic, proven approach that makes the sight more versatile across training, defensive use, and general range work. OpticsPlanet+2joeboboutfitters.com+2
Tool-free Windage Adjustment: Make Corrections On the Fly
Zeroing and refining your point of impact shouldn’t be a chore. The UTG Accu-Sync rear sight includes tool-free windage adjustment, so you can dial in corrections efficiently without hunting for extra tools on the bench or at the range. OpticsPlanet+2joeboboutfitters.com+2
Rock-solid Mounting: Recoil Stops + Single Locking Torx Screw
A rear iron sight is only as good as its ability to hold zero. UTG addresses this with a low-profile mounting base, square-shaped integral recoil stops, and a single locking Torx screw designed to provide a secure fit and reliable return to zero on MIL-STD-1913 Picatinny rails. This is a big deal for shooters who remove/replace accessories or run rifles that see frequent transport and handling. OpticsPlanet+2browe-inc.com+2
Designed to Pair with the Matching Accu-Sync Front Sight
If you’re building a coordinated set, UTG notes that this rear sight is designed to match the UTG Accu-Sync Spring-loaded AR15 Flip-up Front Sight (MNT-757), giving you a consistent look and feel across your front and rear irons. OpticsPlanet+2joeboboutfitters.com+2
Ideal Uses: Who This Rear Sight Is For
The UTG Accu-Sync flip-up rear sight is an excellent choice for:
Shooters running optics who want a backup rear iron sight (BUIS)
AR owners building a lightweight, low-profile rifle configuration
Training setups where quick transitions to irons matter
Anyone wanting a spring-loaded flip-up rear sight with positive lockup and easy adjustment OpticsPlanet+2joeboboutfitters.com+2
Product Identifiers for Listing and Inventory
For accurate purchasing and cataloging, here are the key identifiers:
Brand / Manufacturer: Leapers, Inc. / UTG
Product: UTG Accu-Sync® Spring-loaded AR15 Flip-up Rear Sight
Color: Black / Matte Black
Model / Part Number: MNT-957
EAN: 4717385553712 OpticsPlanet+2impactguns.com+2
A Dependable Flip-up Rear Sight for Real-world AR Builds
If you want a rear iron that deploys quickly, stays locked when you need it, and maintains a secure mount on Picatinny rails, the Leapers UTG Accu-Sync Spring-loaded AR15 Flip-up Rear Sight (MNT-957) is a strong, practical upgrade. With push-button spring deployment, dual apertures, tool-free windage, and a mounting system designed for secure zero hold and return to zero, it’s a no-nonsense solution for shooters who take reliability seriously. OpticsPlanet+2joeboboutfitters.com+2
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