I was in a club in the U.K. where "sound moderators" were mandatory. The club was in town & the "Noise Abatement Act" required us to keep sall sounds below 85 DB. So "sound moderation" was legally required.
It was a small town club, an indoor range with 8 firing points.
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& over 500 members!
To put this into context though, in reality there's virtually no difference in supressor ownership from the regulatory point of view in the two countries.
The process to aquire & maintain a firearms certificate in the U.K. was (not sure currently, its been a while) about the same as the process for NFA (National Firearms Act) items over here. So you went through a similar process either way, it just that you did it earlier before aquiring a firearm & having a need for a sound moderator.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”