Product Description

ASE Utra S Series SL6i Sound Moderator

The ASE Utra S Series SL6i Sound Moderator is a premium over-barrel rifle suppressor engineered for powerful hunting calibres from 9mm through to .375 H&H Magnum. Manufactured in Finland by ASE Utra Oy, the SL6i combines exceptional durability with a lighter, more compact design than the previous SL6 model, making it an ideal choice for stalkers, professional hunters, and shooters demanding reliable recoil reduction and sound suppression.

Constructed from high-grade 300 Series stainless steel, the SL6i is fully welded to create an incredibly robust moderator capable of withstanding years of heavy field use in demanding environments. Its slim 44.5 mm diameter maintains excellent sight clearance while the over-barrel design keeps additional rifle length to just 126 mm, preserving the handling characteristics of your rifle.

The SL6i delivers excellent sound reduction of up to 22 dB(A) while significantly reducing felt recoil and muzzle flash. This makes shooting more comfortable, speeds up follow-up shots, and helps minimise disturbance when hunting. Depending on calibre and ammunition, rifles fitted with the SL6i have been tested to comply with the European Directive 2003/10/EC personal exposure limit for impulse noise.

Whether you’re pursuing dangerous game abroad or controlling large deer species at home, the ASE Utra SL6i offers outstanding performance, durability and precision engineering trusted by hunters and professional shooters worldwide.

Key Features

• Designed for powerful hunting calibres from 9mm/.357 – .338 Win Mag 
• Lightweight evolution of the proven ASE Utra SL6 design
• Precision manufactured in Finland
• Fully welded 300 Series stainless steel construction
• Compact over-barrel design
• Only 126 mm added to rifle length
• Slim 44.5 mm diameter for improved handling
• Reduces recoil significantly
• Minimises muzzle flash
• Sound suppression up to approximately 22 dB(A)
• Available in blasted stainless steel or durable CeraKote finish
• Multiple thread options available
• Built for long service life
• 2-Year manufacturer warranty

Suitable Calibres

The ASE Utra S Series SL6i is suitable for:

• .338 Winchester Magnum
• 38/357 Mag
• 9.3×62
• 9.3×66 Sako
• .375 Holland & Holland Magnum

Technical Specifications

Why Choose the ASE Utra SL6i?

The SL6i has been developed for shooters who require maximum reliability without unnecessary bulk. Its welded stainless steel construction provides exceptional strength while the updated lightweight design improves rifle balance compared to previous generations.

With substantial recoil reduction and effective muzzle blast suppression, the SL6i helps improve shooter comfort, maintain target acquisition and reduce disturbance in the field. Its proven durability makes it suitable for everything from recreational stalking to demanding professional use.

Frequently Asked Questions

Is the ASE Utra SL6i suitable for magnum calibres?

Yes. The SL6i is specifically designed for larger hunting cartridges including .338 Winchester Magnum, 9.3×62, 9.3×66 Sako, and .375 H&H Magnum.

How much sound reduction does it provide?

Depending on calibre and ammunition, the SL6i provides approximately 18–22 dB(A) of muzzle sound suppression and around 21–22 dB(A) at the shooter’s ear.

Does it reduce recoil?

Yes. The SL6i significantly reduces felt recoil, improving shooting comfort and allowing faster follow-up shots.

What thread options are available?

The moderator is available in a range of common metric thread sizes including M15x1, M17x1, M18x1, with additional thread options available to suit many modern rifles.

Where is the ASE Utra SL6i manufactured?

Every ASE Utra S Series SL6i moderator is manufactured in Finland using precision engineering and high-quality stainless steel materials.