The PKMN in game can only attach the 1P29 scope, while it should also be able to attach the PSO-1 scope, there are a few photos online of this being done, and arguably the PSO scope would be more common to acquire in the field than the 1P29.
Personally when I first got hands on the PKMN back when I started playing and couldn't put the PSO on it I was very disappointed.

I understand the AKs shouldn't be able to take the PSO-1 because of a few issues with the SVD type mount on the scope, and part of the scope body colliding with the dust cover, but on the PKM this isn't the case, and it can be attached with the normal SVD type mount as in game.



I've also seen photos of the 1P21 scope being used on a PKMN, but one can dream.... I'd ask the developers to consider that scope being a pretty much perfect counterpart to the ART scope on the M21, bringing the SVD a bit closer in capability.

I'll also take the chance to remember the few bugs with the PKM such as the ammo box appearing in the middle of the gun instead of under, missing sight positions, and the different weird bits on the model, such as the wrong metal finish, wrong wood finish, and part of the ammo box being finished like the gun when it should be all completely green...