---
product_id: 2665750
title: "Mil-Spec Back-up Iron Sight (B.U.I.S)"
brand: "matech"
price: "€ 266.09"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/2665750-mil-spec-back-up-iron-sight-b-u-i-s
store_origin: NL
region: Netherlands
---

# Adjustable up to 600m precision Spring-loaded aperture for instant deployment Mil-Spec durability & Picatinny mount ready Mil-Spec Back-up Iron Sight (B.U.I.S)

**Brand:** matech
**Price:** € 266.09
**Availability:** ✅ In Stock

## Summary

> 🎯 Lock, Load, and Never Miss: Your Ultimate Backup Sight

## Quick Answers

- **What is this?** Mil-Spec Back-up Iron Sight (B.U.I.S) by matech
- **How much does it cost?** € 266.09 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/2665750-mil-spec-back-up-iron-sight-b-u-i-s)

## Best For

- matech enthusiasts

## Why This Product

- Trusted matech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Crafted from rugged iron to withstand the toughest field conditions.
- • **Rapid Response Design:** Spring-loaded aperture ensures lightning-fast sight activation when seconds count.
- • **Seamless Compatibility:** Effortlessly mounts on any Picatinny rail for universal rifle integration.
- • **Sleek Tactical Profile:** Matte black finish blends stealth with professional-grade functionality.
- • **Pinpoint Accuracy at Distance:** Fine-tune your aim up to 600 meters with military-grade precision.

## Overview

The MaTech Mil-Spec Back-up Iron Sight (B.U.I.S) is a precision-engineered, spring-loaded iron sight designed for rapid deployment and adjustable targeting up to 600 meters. Constructed from durable iron with a matte black finish, it mounts securely on any Picatinny rail, making it an essential tactical accessory for professional shooters and archery enthusiasts seeking reliable backup aiming solutions.

## Description

Matech Back Up Iron Sight Sight Picatinny Black Ranging Aperture BUIS

## Features

- Adjustable up to 600 meters
- Spring loaded sight aperture

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Matech |
| Color | Black |
| Style | Functional |
| Sport | Archery |
| Item Weight | 0.21 Ounces |
| Material | Iron |
| Magnification Minimum | 1 x |
| Compatible Devices | Rifle (Picatinny Mount Compatibility) |
| Mounting Type | Picatinny Mount |
| Night vision | No |
| Model Name | MaTech Mil-Spec Back-up Iron Sight (B.U.I.S) |
| Manufacturer | Matech |
| Reticle Type | Post or Peep |
| UPC | 757183266821 121227427347 610242000555 133588902043 956263181416 |
| Item Package Dimensions L x W x H | 5.71 x 3.58 x 1.65 inches |
| Package Weight | 0.14 Kilograms |
| Item Dimensions  LxWxH | 5.91 x 6.3 x 6.69 inches |
| Brand Name | Matech |
| Suggested Users | unisex-adult |
| Part Number | BUIS |

## Product Details

- **Brand:** Matech
- **Color:** Black
- **Style:** Functional
- **Sport:** Archery
- **Item Weight:** 0.21 Ounces
- **Material:** Iron
- **Magnification Minimum:** 1 x
- **Compatible Devices:** Rifle (Picatinny Mount Compatibility)
- **Mounting Type:** Picatinny Mount
- **Night vision:** No

## Images

![Mil-Spec Back-up Iron Sight (B.U.I.S) - Image 1](https://m.media-amazon.com/images/I/410xzjvOFJL.jpg)

## Questions & Answers

**Q: Is this a genuine MaTech or an airsoft copy?**
A: It's genuine, she holds zero just fine and is rock solid.

**Q: What is the best front sight to match with this?**
A: I have a GG&G 1281 Flip Up Front Sight.  They work well together.  Make sure that if you go that route, pick the sight that fits what your gun has.  Some gas blocks are lower than the plane of where the rear sight mounts.  If that's the case, choose the one that specifies "for gas block mounting."  Mine happens to be the same plane all the entire length of the rifle, so this one worked fine.  It's all aluminum and matches the finish on my rifle very well.  Flip ups are nice when you opt to run optics also.  Likewise, for red dots, it can cowitness if desired.  A good red dot will not require a cowitness.  The sight pops up with authority and locks in place.  Once locked, it's very solid and steady.  To fold, just press the button once more and fold it down...again solid engagement.  There are many other sights to choose from.  Some excessively high dollar ones that do the same job.  As a Soldier with over 24 years experience with this particular platform and various sights and optics, as long as it's zeroed properly and remains undamaged, it'll perform better than the shooter for years to come.  The front sight tool that this sight uses is the four prong one.  For only a few bucks, it's worth buying it as well.  The other option is to use a nail or the tip of a bullet to depress and move the sight as needed...usually causing little scratches where the tool does not.  Hope this helps.  Hit me up if you ever have more questions that I may possibly have an answer to.

**Q: Will this work on a Magpul (not the gasblock version)**
A: Yes

**Q: Does anyone know what grain (5.56) bullet matech intended to be used with the sight in order for the elevation adjustment to work properly?**
A: For or all practical purposes, up to 500 meters it will work for all NATO ball ammo (M193, M855 and even M80).  Though it is technically calibrated for 62 grain 5.56 NATO SS109 projectiles, you will not see any real world difference if you use it with 5.56 NATO M193 or 7.62 NATO M80, since the difference between the three rounds drop at 400 meters is only four inches between them.   Which is why it is an excellent back up sight. 

FM 3-22.9 RIFLE MARKSMANSHIP M16-/M4-SERIES WEAPONS

5-89. The M16A2/A3/A4 rifle and M4/M4A1 carbine fire both M193 and M855 ball ammunition with
little difference in accuracy to a range of 500 meters.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great BUIS
*by A***N on August 13, 2025*

Used this in the military, and got it for an AR build. The real deal.

### ⭐⭐⭐⭐⭐ Solid Sight ...Great Performance!
*by Z***W on March 25, 2017*

It is easy to become a fan of this well made sight for the AR. This is a great sight to co-witness with optics or just as stand alone iron sights. They are on every AR that I own and have built. Shooting buddies have quickly adopted these to their builds as well. It's solid platform and easy of use and it's ease of sighting in are a real plus. It is rugged and that explains why the military uses it.These co-witness with the Eotech and other red dot optics. With a log scope and 20 or 22 inch match barrel it works on a 45 degree mount and flip up front sights. Low profile and solid. A Midwest Industries flip up front sight mates up nicely. In Afghanistan I saw these on hundreds of rifles in daily use and they perform under the harshest of conditions. Brush the dirt, dust and mud off and keep on going. I have seen a few rust slightly but that was poor maintenance. Clean them and oil them lightly after exposure to the elements and these will hold their point of aim and be good for a lifetime.

### ⭐⭐⭐⭐⭐ Perfect Sight
*by S***A on November 11, 2019*

Probably the best back up rears available based on price, size, and functionality. I zeroed at 25 and then flipped to the 200 setting and was hitting plates with no issues using an A2 front sight. It is sturdy (all metal), and pretty compact. Distance switch is firm without being hard to adjust so no risk of unwanted selection change.Be aware that you may need to be careful if you're using a scope+mount as your primary sight with this as the backup. The standard height mount I used was probably a milliliter from touching the sight. I swapped it out for a tall mount to ensure there was clearance.The only back up irons I've seen that are functionally better are the ones from KAC but those are way more expensive.

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-16*