When one fits a Mosin barrel to a P-14 Enfield there is only a shoulder of about 0.028 available. The shoulder on P-14 and 1917 barrels is about 0.100. There may not be an adequate shoulder to allow the use of the Mosin barrel. Barrels for use on the P-14/1917 Enfields usually are ordered with an larger barrel shank at the breech end.

Bill