My "play" barrel.
Started life as a 20" w/rifle gas system, then it became an 18" with a rifle gas system, then it became an 18" with MID gas system, and now its a 12" with MID gas system.
Under 200rds through this barrel, it is threaded 1/2x28 as it wore a Krink flash hider when last fired. Looking down the bore, it looks perfect. Is gun koted black.
I'm done with what I needed it for.