Nielsen Sonic 55

A muffler for the very powerful calibers such as: 7 mm Mag., 300 Mag., .338 Lapua Magnum and .375 Cheytac


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 14 cm fra mundingen

Ample volume
With its large volume, a Sonic 55 muffler will provide the greatest reduction in decibels on the larger calibers. It also has the capacity to attenuate even the largest magnum calibers. Not only is a Sonic 55 great, it is strong. This damper is suitable for all calibers from Cheytac .375 and down.

For calibers with a ball diameter of more than 9.5 mm, we make a special variation of our Sonic Ghost muffler, which can handle projectiles up to cal .458 – here it is not about the volume of the gunpowder gases, but about the actual hole size through the muffler

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.


1/2 x20", 1/2 x28", 5/8 x24", M13x1, M14x1, M14x1,5, M15x1, M16x1, M17x1, M18x1

Max Size

Max .30, Max 6, Max 7, Max 8, Max 8,5, Max 9,5, Unsure

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.

Sonic 55 is the largest muffler we produce. It is aimed at the largest calibers and for those who want the best possible attenuation. A Sonic 55 handles both .338 Lapua Magnum and .375 Chey Tac without any problems.

Due to the large volume of a Sonic 55, it is not produced for 6 mm calibers. For maximum attenuation on these calibers, we refer to the Nielsen Paradox 50 silencer.

Technical data

Weight: approx. 710 grams
Diameter: 55 mm
Length: 295 mm
Elongation of pipe: 155 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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