Above have beat me to the 'punch', but I'd think a muzzle forward magnum suppressor might do it.
Got a Waitaki SS magnum suppressor for the Omark target rifle, for F/TR.
Not much more noise than a 223 AR-15 (shot in the National Service), than I recall - but magnum suppressors have more capacity, so could be the way to go.
Says a very inexperienced suppressor user.
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