This 28" barrel is new, Douglas Air Gauge.  Tapers very slightly from 1" at the muzzle to 1-1/16" at the breech.  It is threaded for a high wall, and chambered for .225 Winchester.  Muzzle has a recessed crown.

This was an unfinished project I purchased, threaded but never installed and no extractor cut.  I tried it in a high wall action, and it is quite tight.  I have one action it will thread all the way into by hand, two others it won't start.  it measures about .010" oversize on the threads.  So, may have to be touched up on the threads to fit your action.  

I'm pricing it at the price of a blank.  $300 plus $20 shipping.

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