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SNT Motiv STSM21

Modular Submachine Gun (SMG)

South Korea | 2024

"The modular-minded, tactical-level STSM21 submachine gun is currently under development by South Korea-based SNT Motiv."

Authored By: Staff Writer | Last Edited: 09/13/2022 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
Currently (2022) under development by South Korean small arms-maker SNT Motiv is the "STSM21", a 9mm-chambered Close Quarters Battle (CQB) Warfighter solution. The design takes into account all proven modern trends in military-level automatic firearms design and presents it in a compact form suitable for urban fighting and SPECial OPerationS (SPECOPS) service. Modularity is at the forefront of this submachine gun with a long length of Picatinny rail set over the receiver - optional front and rear iron sights can be used while optics, aimers, and tactical flashlights. Construction is of durable metals as well as lightweight composites.

The design of this firearm is largely conventional: there is a small, lightweight, adjustable, and collapsible shoulder stock at the rear of the frame. The frame itself is home to the fire selector (within easy reach of the thumb), ergonomically-shaped pistol grip, and oversized trigger ring for a gloved hand. The magazine well sits ahead of the action in the usual way with the ejection port seen just above. All controls are ambidextrous to broaden the gun's market appeal and this includes the charging handle as well as the magazine catch. Magazines are of the straight type and house 20- or 30- 9x19mm Parabellum pistol cartridges. Internally, the gun makes use of the proven delayed blowback system-of-operation. The forend is perforated and the barrel is slotted.

One of the more unique features of the STSM21 is its use of a free-floating barrel, a practice common to sniper rifles where accuracy is the call of the day. The free-floating arrangement has the barrel only touching the frame along its length (and not the forend housing itself) to promote accurate fire.

Overall length of the gun reaches 680mm (600mm collapsed) with a 220mm long barrel assembly - making it ideal for close-quarters work due to inherent portability. Overall unloaded weight is 3.0 kilograms.

Content ©MilitaryFactory.com; No Reproduction Permitted.
The physical qualities of the SNT Motiv STSM21. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
680 mm
26.77 in
O/A Length
220 mm
8.66 in
Barrel Length
6.61 lb
3.00 kg
Delayed Blowback System.
9x19mm Parabellum
20- or 30-round detachable box magazine.
Optional Iron Front and Rear; Over-Receiver Optics Supported.
Notable series variants as part of the SNT Motiv STSM21 Modular Submachine Gun (SMG) family line.
STSM21 - Base Project Designation.
Global customers who have evaluated and/or operated the SNT Motiv STSM21. Nations are displayed by flag, each linked to their respective national small arms listing.

Contractor(s): SNT Motiv - South Korea
National flag of South Korea

[ South Korea (possible) ]
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Image of the SNT Motiv STSM21
Image from official SNT Motiv marketing materials.

Going Further...
The SNT Motiv STSM21 Modular Submachine Gun (SMG) appears in the following collections:
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