Some rifles make more noise when suppressed than other styles... Semi's often have some noise escape the breech end as it cycles (I may not be 100% accurate but seemed true to my ears years ago when several suppressed rifles were used on the same firing line) but the biggie is ammo...
Super sonic ammo (most factory loads are) has a sonic boom. But it has been proven most of the time that the imposed fear is lesser and shorter lived if they spook to suppressed gun fire compared to naked muzzles...
Brent
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