Nielsen Sonic 40 Compact

A small and compact muffler. Designed for .300 Blackout, but perfect for small and medium calibers from .243 to .308


Read more about weight, dimensions, maintenance and other recommendations in the tabs under the product – or in the banner at the top under “Instructions.”

Opgiv venligst pibe diameteren ved mundingen

Opgiv venligst pibe diameteren 7 cm fra mundingen

Developed for .300 BlackOut
We have developed this muffler for calibers with relatively small charges but still medium-sized projectiles. The result is a small and compact muffler that works really well on smaller calibers up to .308 – Nielsen Sonic 40 compact is also available in a “max 9” size specifically for 9 mm parabellum.

The muffler only goes 7 cm down over the pipe, and therefore has a smaller profile than e.g. a Nielsen Paradox 40, which is otherwise comparable in size.

The steel cores
To make the damper as solid and durable as possible, this damper has been fitted with a steel core that ensures that the damper can withstand the high temperatures that occur when firing many shots within a short period of time.

Caliber recommendation

When choosing your muffler, it is important that you choose a muffler that fits the caliber you are using. On the graphic you can see which calibers can be shot through the muffler, as well as how well the amount of gunpowder can be handled by the muffler.

The Sonic 40 Compact muffler is specifically designed to be effective on the .300 BlackOut caliber. However, the muffler also applies to other smaller calibers.

Technical data

Weight: approx. 300 grams
Diameter: 40 mm
Length: 192 mm
Elongation of pipe: 117 mm
Maximum pipe thickness: 23 mm

In Denmark, all Nielsen Sonic silencers are covered by a 5-year total warranty, provided they are purchased directly from us, and the customer shows up at our production with both the silencer and the rifle it is mounted on.


Never shoot the pipe too hot. Feel free to give the muffler a puff WD40 or similar at the rear end before mounting and after disassembly. Especially if the muffler is used in humid weather.
Always allow the muffler to dry before placing it in storage.
Clean the muffler as needed, using only oil and a cloth. A ride on the shooting range where the muffler is shot moderately hot will also clean it of excess soot.
Avoid using alkaline cleaners, ultrasonic cleaners or brush and scrub cream.
If it is to remain possible to separate the muffler, it is recommended that you regularly separate all modules and apply a little new thread lubrication.


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