http://www.midwayusa.com/product/13...ver-stripped-ar-15-low-profile-flat-top-matte
I figure this, with the RTV charging handle should help contain the gasses. I know port noise is a common complaint about the AR-15 in 9mm suppressed.
No ejection port cover means no go for me. Ranier has one with an ejection port door and no forward assist that I'll be using. Also the second gen BCM charging handle has a built in gas buster so no rtv for me.