Subsonic ammunition

In general, not to mention the overbore part.

And for that matter, what about other .30 caliber rolls that a lot of you end users expect your .30 caliber silencers to fulfill, like Subsonic .300 Blackout? Well, that's even more different than .556.

You're going from intermediate rifle cartridges to pistol cartridges, basically.

So as a designer...