where did you find this pics? its maybe 17 years ago that a local gun shop here had have a similar sporter in 7,62x54R, heavy engraved with oak leaves all over the action and scope, also the stock. scope mount was again a MS claw mount and it was feed from the original mosin magazin. the rifle was just perfect but I dont had enough interest and not realy care about this. dont know who made this work and where the rifle gone. this sporter here have a additional safety on the pistol grib and a modified magazin hiding in the stock. this make the shape of the stock not completly perfect.
such single row magazin's looking very good on M88 and Mannlicher sporting rifle's. in my opinion its not realy nessesary to change the mosin magazin.