'mcoulter' - That is a replacement barrel that is made from a shortened Krag rifle barrel. The rear-sight is a 1901 Krag rifle sight.

IMHO - The barrel will actually prove to be a little more than 22 inches long. (22&1/2" to 22&3/4" - is my estimate from the photo).

The 1905 Springfield front-sight installation and muzzle crown were nicely done, but, not likely at Springfield or Benicia.

This Krag's best asset is its very nice model 1899 carbine stock. My appraisal would be $550 to $700, but, it would not be in great demand, these days.