Roe had to pullout my Rem 14 35rem rifle with factory extra's to compare rear stock style, it is 99% the same as mine, but checkering is very different, but real nice your is! I will quote from the Stoeger 1939 Remington "EXTRA'S SUPPLIED ON REMINGTON RIFLE"
Checkering standard grade stock and forend. Extra, except where regular $4.40
Full pistol grip with rubber cap on Model 141A,141C,30A,81A,81C, Extra $4.40
The gun is nice whether anyone else thinks it factory, or non-factory, but I would have Noel help you with his contact whether it is factory, as I believe the rear stock is! Could you post close ups of the peep sight, because weather it is factory made or machinist made, it intriges me very much.