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About the extended magazine for the SKS: it is a completely self-contained unit with its own spring and follower. I have heard mixed reviews as to reliability and I don't own one. Besides, the standard 10-round magazine works flawlessly and is CA compliant, so why bother?

Here: http://www.parts4sks.com/

Unlike the M1 Garand with its enbloc clip containing the ammo that is inserted into the rifle, the SKS is loaded from a 10-round [reusable] stripper clip into the rifle's integral magazine. On the last shot, the bolt carrier locks to the rear and a new stripper clip of 10-rounds is inserted into the clip guide for reloading the magazine. Once the magazine is loaded, the empty stripper clip is removed and the bolt is closed to chamber the top round in the magazine.

The SKS was designed to operate with minimal care and to resist the effects of ammunition with corrosive primers. The bolt carrier, bolt assembly, barrel chamber and bore, and gas piston and tappet are all chrome plated. This adds a great deal of reliability to the rifle under extreme field conditions.

Iron sights on the SKS are primitive by modern standards. The rear sight is adjustable for range only and incorporates a 250-meter battle sight setting. Fine elevation changes are accomplished by screwing the front sight up or down; windage by pushing the adjusting slide right or left.

Mounting optics on the SKS is a challenge. There are replacement rear covers with blocks attached for scopes. I have one of these but the eye relief is too short for me and attachment is not secure enough to retain the scope's zero in my opinion. The best way to mount optics is replace the upper handguard with a aftermarket rail. You can use a long eye relief scope or a red dot sight. [I think the red dot is superior, but that;s just my opinion.] Alternatively, there is a rail system that replaces the rear sight, but now you're stuck with no backup sight if the optic is damaged.