Well I'm looking at getting one of these and wonder about these three brands. Well, I don't wonder about DD but their Ambush line has me confused a bit. Seems more like a rifle made for hunting but not to mil-spec necessarily which concerns me. Or should it? Their "ads" allude to functional issues when shooting subsonic ammo without suppression whereas DD doesn't. Not that I would throw away SS ammo unsupressed but if I accidentally shoved in a mag of that without the suppressor on, I'd hate to have a non-functioning rifle just because. And I know nothing about AAC but their Blackout rifle seems to have the right stuff, seems. I'd really appreciate any thoughts from those that know the finer points, have owned any of these, and what is the deal wth Ambush. Many thanks for any info.