A Chinese SKS is really no different than any other SKS.
The way to field strip it is to lift the small lever at the back of the dust cover and pull out the pin. The dust cover will lift off and the bolt and carrier will be accessible to be removed.
Lifting the little lever on the side of the rear sight block will allow the gas tube and piston to be removed.
Take it to a gunsmith and ask for help.
Markings.
Check the receiver.
Is it marked with Chinese characters or in the Cyrilic alphabet? <><><> As above. In addition, MOST Russian SKS rifles had blade style bayonets. MOST Chinese rifle had a spike type bayonet. But marlings are the defintive answer.
you can find sks rifle at virtually any gun shop but searching for a Chinese version may be a little more difficult.
Priceless, since a true SKS assault rifle would be a prototype only most likely. The SKS fires semi-automatically and does not have provision for full auto fire. If you have a normal run of the mill Chinese SKS it is worth 100-400 or so depenidng on condition, box, accessories, etc..
5000-10000 usd
About 400 meters
About $300, depending on condition.
The SKS isn't an assault rifle, although some of the Chinese variations (such as the SKS-M and SKS-D) do meet the criteria for the definition of a "civilian assault weapon" by BATFE regulations. Although China was prohibited from further arms sales in the US in 1994, the Type 56 carbine (Chinese designation for the SKS) is still pretty widespread, and can still be found at gun shops, gun shows, pawn shops, online gun auction sites, etc.
This is purely opinion on my part, but the SKS was created in Russia, and made there for a number of years before the Chinese began manufacture. The Russian SKS tends to have better quality machining than the Chinese. Both are good, but the Russian is the original, and the better built rifle. Examine one of each side-by-side, and see what you think.
$125.00 to $225.00 condition and matching numbers on the parts has an effect on price .