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With all centerfire suppressors, the use of subsonic ammunition is heavily advised; supersonic rounds still create a 'crack' when breaching the sound barrier.
Considering that when customers start shooting this rifle for themselves, they'll undoubtedly attempt to shoot subsonic ammunition unsuppressed, we did, too.
In addition, a suppressor can be mounted, and the rifling twist of 1:11 was utilized specifically for best accuracy with subsonic ammunition.
A 9x19mm AR is also very easy to suppress and very quiet when fed subsonic ammunition.