Anyone using a 300 Blackout AR? I thought about a 300 Whisper about 10 years ago, but never had a strong enough urge to build one. One of the reasons is my infatuation with wildcats went away. Since AAC has commercialized the cartridge, I am looking at it again. A buddy who is a LEO is building one on a NFA configuration with a can. Watching the videos of suppressed AAC firing and I am getting the urge to play again. For those not familiar with the 300 Blackout (7.62x35), it's very similar to the 300 Whisper which is a .221 Rem Fireball necked up to .30 caliber. With 220 gr bullets, it can be loaded subsonic and is a quiet, sweet shooter out to 100 yards.