The 7.92 x 57mm, 7.65 x 53mm, 7 x 57mm, and .30-06 versions of the SKS have already been built, designed by Mr. Saive at Fabrique Nationale, it is the FN-49. The 7.62 x 51mm (.308) was built for the Argentine Navy from the 7.65 x 53mm. The system is a little more advanced than the SKS because even though the designs for the system had been copyrighted, due to WWII the production of the FN-49 was delayed until 1949, and it was so labeled.
Since Simonov actually completed his design of the SKS while reviewing the Copyrighted drawings of the FN-49, it is no wonder that they are so similar. About 175,000 FN-49's were built in the various calibers, the most, about 125,000, being in .30-06. Give credit to
http://walnut.tmcom.com/~jlandry/firearms/FN49.html
for the following data:
6.5 Swede - - - - - - - - - 5 produced for testing
7 x 57mm Mauser - - - - 8,003 produced for Venezuela
.30 M2 (.30-06) - - - - - - 125,072 produced for Belgium, Belgian Congo, Luxembourg, Indonesia (Dutch East Indies), Columbia, and Brazil
7.5 x 53mm - - - - - - - - - - - -1 produced for testing
7.62 x 51mm - - - - - - - - - - - 1 produced for testing
7.65 x 55mm - - - - - - - - - - -5,541 produced for Argentina about 1,000 of these were converted to 7.62 x 51mm
7.92 x 57mm (8mm Mauser) -37,641 produced for Egypt and a few for British testing
Since Simonov actually completed his design of the SKS while reviewing the Copyrighted drawings of the FN-49, it is no wonder that they are so similar. About 175,000 FN-49's were built in the various calibers, the most, about 125,000, being in .30-06. Give credit to
http://walnut.tmcom.com/~jlandry/firearms/FN49.html
for the following data:
6.5 Swede - - - - - - - - - 5 produced for testing
7 x 57mm Mauser - - - - 8,003 produced for Venezuela
.30 M2 (.30-06) - - - - - - 125,072 produced for Belgium, Belgian Congo, Luxembourg, Indonesia (Dutch East Indies), Columbia, and Brazil
7.5 x 53mm - - - - - - - - - - - -1 produced for testing
7.62 x 51mm - - - - - - - - - - - 1 produced for testing
7.65 x 55mm - - - - - - - - - - -5,541 produced for Argentina about 1,000 of these were converted to 7.62 x 51mm
7.92 x 57mm (8mm Mauser) -37,641 produced for Egypt and a few for British testing