LE6921EPR-CK
I've been looking for a 14.5" (ish) upper for a Colt lower I have sitting around. This popped up and looked interesting, but the interweb is thin on reviews. On the one hand, it's Colt, so I assume it's GTG, but I know Colt has switched hands recently, and I'm unsure what the implications are for the quality of their current production items.
I would likely P&W a Rugged suppressor mount to this for compliance, although I need to double-check the length on those first.