Not many details here but it gives some hints about how to set one up.

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Here's a more portable possibility. Looks like you could use a 55 gallon drum and line it with eggshell foam. Might not be as good as a longer set of tires but certainly easier to manage.

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These mufflers on a Swiss rifle range apparently reduce noise levels to 20 db which is pretty quiet.

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Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!