I have read that it will work as long as your load is subsonic. What do you NFA pro's think? I was thinking about buying a whisper but the wait time on the can is going to be killer and I already have a trident 9. I read somewhere that osprey even raes their 9mm can as 300 blk rated on full auto.
Will I need to change mounts from the booster mount on my trident 9?
Will I need to change mounts from the booster mount on my trident 9?