Originally Posted by PistolRogue
The barrel is brass inside the whole length. The one with the little brass collar at the end of inner diameter is the inner feedtube and is there to provide a little "step" in the bore to keep the pusher from coming all the way out, if I'm reading what Smiley is saying correctly.
Rogue is correct,
the barrel is .678" brass full length unported.
The short brass ring is a stop collar to keep the spring plunger from popping out of the tube.
this is the barrel before it was sleeved.