How does clip lock into a Chinese sks?
The clip does not lock into the rifle. To load the SKS, you
would first lock the bolt to the rear (this requires the magazine
to be inserted). You would then take the clip - which holds ten
rounds of ammunition - and insert it into the slot at the front of
the bolt carrier. You would then push down on the rounds to feed
them from the clip into the magazine. After the magazine is loaded,
you then pull upwards to remove the clip, at which point, you can
chamber a round and begin firing. See related link "SKS carbine
operations" for a visual demonstration of this process.
If you're looking for how to install the magazine into the SKS,
check the related link "SKS Assembly and Disassembly". See also the
related link "Clips vs. Mags"