There are many like it. This one is mine. CMMG complete upper on clearance from Midway. 14.5 pinned/welded. Auto BCG without any hpt/mp marks, and one piece gas ring. (I forget the name, I've used them before)
420 rounds* in less than an hour. No trouble with steel tula- a first for me. The only problem I had was my replacement brasscatcher is a steaming pos and jammed it three times. Once I bent it to match the upper, it worked great. Reloads worked fine, as did .223 and 5.56.
Not too bad at the target end. I did not mess with the sights at all. Just slapped the new TRS 25 on and started banging away.
*Not a weed ref. 2X standard loadout reference. Okay, it was what I had laying around.