Support Equipment

NSB optical sight

Also known as
  • NSB
  • NSB-4A
  • NSB-4B
  • NSB-4A sighting device
  • NSB-4B sighting device
  • NSB optical sighting devices
  • NSB-4B mortar sight

The NSB optical sight family is a Croatian/Bosnian fire-control accessory line for indirect-fire weapons. M Adler D presents NSB-4A for the LRL-128 light rocket launcher and NSB-4B as a universal mortar sight, while Zrak and Yugoimport material describe the sights as optomechanical devices for taking elevation and azimuth elements in daylight and night conditions.

NSB optical sight, Optical sighting device family for indirect-fire weapons, Support Equipment
Image source: M Adler D Products Page
Profile / Specs

Profile

Origin
Croatia / Bosnia and Herzegovina
Built by
M Adler D
Type
Optical sighting device family for indirect-fire weapons
Service note
Contemporary
Designer
M Adler D / ZRAK d.d.
Produced
Current production

Specifications

Variants
NSB-4A and NSB-4B
NSB-4A role
Sighting device for the LRL-128 light rocket launcher
NSB-4B role
Universal sight for mortars, including the MMB17 family
NSB-4A magnification
3.7x
NSB-4B magnification
1.8x
Field of view
8 degrees for NSB-4A; 8 degrees +/- 5% for NSB-4B
Angular division
1/6000 or 1/6400 in Yugoimport NSB-4A and NSB-4B brochures
Vertical telescope tilt
-13 degrees to +25 degrees in Yugoimport NSB-4A and NSB-4B brochures
Illumination
M Adler D lists tritium illumination for NSB-4A and LED battery illumination for NSB-4B; Yugoimport brochures list LED reticle and bubble-level illumination for both
Temperature range
-30 C to +55 C working; -40 C to +70 C storage in Yugoimport brochures
Set weight
1.90 kg for NSB-4A complete set in M Adler D data; 3.5 kg for NSB-4B complete set in M Adler D and Zrak data
Sight body weight
0.92 kg for NSB-4A in Yugoimport data; 0.8 kg for NSB-4B in Zrak data
Variants

M Adler D separates the NSB sight family into an NSB-4A rocket-launcher sight and an NSB-4B mortar sight.

VariantConfigurationDesignation notes
NSB-4ALRL-128 light rocket-launcher sight

M Adler D lists NSB-4A as the LRL-128 sight variant, while Yugoimport describes an NSB-4A sighting device for 107 mm and 128 mm multiple launch rocket systems with 3.7x magnification, 8-degree field of view, LED illumination, and -30 C to +55 C working-temperature range.

Sources: M Adler D Product Data, Yugoimport NSB-4A Datasheet

NSB-4BUniversal mortar sight

M Adler D lists NSB-4B as the mortar-oriented variant, Zrak describes it for 81/82 mm and 120 mm mortars when the sight-to-mortar switching connection is coordinated, and Yugoimport gives a 1.8x, LED-illuminated mortar-sight configuration.

Sources: M Adler D Product Data, Zrak NSB-4B Product Page, Yugoimport NSB-4B Datasheet

Launcher Compatibility

M Adler D identifies NSB-4A as the sight variant for the LRL-128 light rocket launcher, and Yugoimport describes NSB-4A for 107 mm and 128 mm multiple launch rocket systems.

Compatible itemItem typeCompatibility evidence
LRL lightweight rocket launcher, Single-tube lightweight rocket launcher, ArtilleryLRL lightweight rocket launcherLight rocket launcher

The current M Adler D product data describes NSB-4A as designed specifically for the LRL-128 light rocket launcher.

Sources: M Adler D Product Data

Compatible Mortars

M Adler D's compatibility data names the NSB-4B sight against all three MMB17 mortar calibers, and Zrak describes NSB-4B as usable with mortars when the switching connection is coordinated.

Compatible itemItem typeCompatibility evidence
MMB17 mortar family, 60 mm, 81/82 mm, and 120 mm smoothbore mortar family, ArtilleryMMB17 mortar family60 mm, 81/82 mm, and 120 mm mortar family

The official product data lists NSB-4B compatibility with MMB17 60 mm, MMB17 81/82 mm, and MMB17 120 mm mortars.

Sources: M Adler D Product Data

Sight Function And Compatibility

The available sources describe NSB as a sighting-device family rather than an independently fielded weapon. Both NSB-4A and NSB-4B are optomechanical fire-control accessories for setting elevation and azimuth, with the launcher and mortar variants separated by host-weapon compatibility.

NSB-4A role

The rocket-launcher variant is tied by M Adler D to the LRL-128 and by Yugoimport to 107 mm and 128 mm multiple launch rocket systems.

NSB-4B role

The mortar variant is listed by M Adler D for MMB17 60 mm, 81/82 mm, and 120 mm mortars; Zrak describes broader mortar use when the switching connection is coordinated.

Relationship limit

This page remains relationship-only because the sources found support product identity, specifications, and host-weapon compatibility, but not direct NSB conflict use.

Timeline

NSB optical sight Key Events

  1. Yugoimport brochures list NSB-4A and NSB-4B sights

    Yugoimport catalog brochures dated in the source URLs list NSB-4A for 107 mm and 128 mm multiple launch rocket systems and NSB-4B for light 120 mm mortars.

    Sources: Yugoimport NSB-4A Datasheet, Yugoimport NSB-4B Datasheet

  2. M Adler D product data presents the NSB family

    M Adler D's current product data presents NSB as a two-variant optical sight family for the LRL-128 launcher and MMB17 mortar family.

    Sources: M Adler D Product Data

Media

NSB optical sight Images

NSB optical sight, Optical sighting device family for indirect-fire weapons, Support Equipment - view 1
Source: M Adler D Products Page
NSB optical sight, Optical sighting device family for indirect-fire weapons, Support Equipment - view 2
Source: M Adler D Products Page
Related Weapon Systems
M80 Zolja, Disposable 64 mm anti-tank rocket launcher, Infantry WeaponsInfantry WeaponsM80 ZoljaDisposable 64 mm anti-tank rocket launcherThe M80 Zolja is a Yugoslav-origin, single-shot 64 mm shoulder-fired anti-tank rocket launcher built around a disposable tube and HEAT rocket. Official Serbian export material presents the RBR M80 as a light infantry weapon for close-range engagements against armored vehicles and fortified positions, while conflict reporting documents Zolja-type weapons in the 2001 Insurgency in Macedonia, Boko Haram materiel evidence, and North Macedonian transfers to Ukraine.
1L125 Niobium-SV, Mobile VHF three-coordinate air-defense surveillance radar, Air DefenseAir Defense1L125 Niobium-SVMobile VHF three-coordinate air-defense surveillance radarThe 1L125 Niobium-SV is a Russian mobile VHF/meter-band, three-coordinate radar built for ground-forces air defense and developed by NNIIRT within the Almaz-Antey group. Rosoboronexport's 1L125E export profile describes a 5-500 km, 360-degree surveillance radar for detecting, tracking, identifying, and reporting aerodynamic and ballistic targets, including low-observable aircraft; Ukrainian and sanctions-derived records identify Niobium-SV radars in Russian service during the Russia-Ukraine war.
60 mm M57 mortar, 60 mm light infantry mortar, ArtilleryArtillery60 mm M57 mortar60 mm light infantry mortarThe 60 mm M57 is a Yugoslav-pattern smoothbore light infantry mortar now listed by Serbian manufacturer PPT Namenska and in Yugoimport export material. Its official sheets describe a high-angle fire-support weapon built around barrel, base plate, bipod, sight, tools, spares, and accessories; post-Yugoslav records also show Serbian surplus stocks and Balkan export activity. In the 2020 Nagorno-Karabakh Conflict, open-source loss documentation recorded M57 mortars captured from Armenian forces.

Sources

M Adler D HomepagePublisher: M Adler D | Note: Supports current M Adler D manufacturer context and the NSB sight family as part of its weapons and fire-control programme. | Accessed: 2026-07-13M Adler D Products PagePublisher: M Adler D | Note: Supports M Adler D's current product-program context and official NSB image provenance. | Accessed: 2026-07-13M Adler D Capabilities PagePublisher: M Adler D | Note: Supports the current M Adler D production-program listing for NSB optical sight and supporting fire-control instruments. | Accessed: 2026-07-13M Adler D Product DataPublisher: M Adler D | Note: Supports NSB-4A and NSB-4B variant identity, specifications, MMB17 compatibility, ZRAK cooperation note, and official image paths. | Accessed: 2026-07-13Zrak NSB-4B Product PagePublisher: Zrak | Note: Supports NSB-4B as a mortar sighting device, its coordinated switching-connection requirement, and selected optical and weight specifications. | Accessed: 2026-07-13Yugoimport NSB-4A DatasheetPublisher: Yugoimport | Note: Supports NSB-4A as an optomechanical sighting device for 107 mm and 128 mm multiple launch rocket systems and selected optical, illumination, temperature, and weight specifications. | Accessed: 2026-07-13Yugoimport NSB-4B DatasheetPublisher: Yugoimport | Note: Supports NSB-4B as an optomechanical sighting device for light 120 mm mortars and selected optical, illumination, temperature, and weight specifications. | Accessed: 2026-07-13