While the majority of
7.62 optics are for 7.62x54R and the SVD Dragunov,
there is one version of the BelOMO POSP that is
designed for use with 7.62x39
and has an appropriate AK mount - The POSP 4x24V.
This is commonly called 4x24 Simonov due to the reticule pattern which is intended for civilian Saiga's and usually has the standard AK MTK83 clamping mechanism instead of the SVD mount.
What makes these excellent optics is the quality to price ratio and the fact that the chevrons are calibrated for 7.62x39. Read more HERE
For a great reference on classic 7.62x54R optics,