[MCF]

In Norway silencers are common. I do believe in some areas it is required. Just go to “finn.no” and search for rifle or vapen. Here is an example: https://www.finn.no/bap/webstore/ad.html?finnkode=206760766&ci=4

[marktwain]

Silencers should be treated the same as any other accessory such as a magazine or a rifle scope.

They are primarily a safety device.

[T.B. Yoits]

In Norway silencers are common. I do believe in some areas it is required.

England too. You can buy them in 3-packs in hardware stores.