Thanks to John for the pic!
Those experiments with 3/5 must be a sight to behold. It appears that silencers are being issued to every swinging dick in the line companies and they're getting a good workout.
Knight Armament is the "test bed" model but I hope the USMC looks for lighter, more compact options. The crazy thing? The more you try and lighten up the AR style battle rifle the more stuff you end up adding to it to make it more effective.
Regardless this is good news. Glad to see the grunts getting a little love.