The S series SMG sound suppressors are available for carbines and submachine guns in 9x19 mm Para calibre Manufactured in Finland by Ase Utra OY, the S series SMG suppressors are manufactured out of 300 series stainless steel and assembled by welding .The S series SMG suppressors have a strong construction and are built to for a long service life.

The small S series S4 SMG suppressor only adds 80 mm to the length of the weapon , the diameter being 45 mm. The S4 SMG suppressor is intended for users seeking a small hearing safe suppressor.

The S series S6 SMG suppressor is intended for users to are seeking for a higher suppression level. The S series S6 suppressor adds 125 mm to the length of the weapon * and the diameter is 45 mm.
The S series SMG suppressors are available with a variety of internal threads and quick mounts to fit on a variety of carbines and submachine guns.

* Figures for suppressors with an HK MP5 mount ( S4 SMG-MP5 and S6 SMG-MP5 )

The S series SMG suppressors reduce the sound pressure level of the weapon by 18-28 dB (dependant on suppressor model and calibre). The S series SMG suppressors also reduce recoil and muzzle flash significantly.
Submachine guns tested with the S series SMG suppressors, comply with the latest personal exposure limit set by the European Directive 2003/10/EC (140 Pa tai 137 dB (C))