Frank, NPM 4.250 - 4.285 appear with Underwood 2-44 and 3-44, and undated Marlin and IBM barrels.
As DaveHH wrote -- NPMs were produced out of serial number sequence; e.g. 4.425 - 4.432 were produced with Underwood 9-43 and Marlin barrels.
Frank, NPM 4.250 - 4.285 appear with Underwood 2-44 and 3-44, and undated Marlin and IBM barrels.
As DaveHH wrote -- NPMs were produced out of serial number sequence; e.g. 4.425 - 4.432 were produced with Underwood 9-43 and Marlin barrels.