Vol;

It is difficult to see the lines of the lumps on these barrels to determine if the lumps are chopper lumps or if they are dovetail. Remove the extractors and see if the lines through the lumps can be seen then they are chopper lump--these barrels may be original to the gun as the Crown/V and 12/C inside of a diamond was used in 1907.

One expects a 1907 Grant to have chopper lump barrels