I have a 12.5 heavy bbl with quick change barrel handle. I bought the item in anticipation of getting a dedicated lower efiled to SBR the set-up but haven't gotten around to it. I want to say I've never fired a round through it but I could be wrong and if so, I CAN guarantee it has had minimal, if any use and appears/functions Like New. My cost was (623 plus 120 from fightlite), I'm willing to part ways with it for 700 if you cover shipping.