The Ase Utra S series sound suppressors are available in various calibres, from .243 Win up to .338 Lapua Magnum. Manufactured in Finland by Ase Utra OY, the S series suppressors are manufactured out of 300 series stainless steel, are assembled by welding.

The S series suppressors have a strong construction and are built to for a long service life.
The small S series S5 suppressor only adds 112 mm to the length of the weapon, the diameter being 45 mm.

The S series S6 suppressor is intended for larger hunting calibres such as .338 Win Mag and 9,3x62. The S series S6 suppressor adds 132 mm to the length of the weapon and the diameter is 45 mm.

In production is also the S series S7 model, for users seeking the maximum sound suppression levels. The S series S7 suppressor adds the length of the weapon by 156 mm and has the same diameter, 45 mm. The S7 model is especially intended for sniper type rifles.

The S series suppressors are available with a variety of internal threads to fit directly onto the rifle barrel. Standard threads include M14x1, M15x1, M17x1, M18x1, ½"x20 UNF to fit most current centrefire rifles.

The S series suppressors reduce the weapon sound pressure level by 22-35 dB (dependant on suppressor model and calibre). The S series suppressors also reduce recoil and muzzle flash significantly.

Rifles tested with the AU S series suppressors, comply with the latest personal exposure limit set by the European Directive 2003/10/EC (140 Pa tai 137 dB (C))