From a gun dealer. Legally the bare receiver IS a firearm, and you will need to go through the same processes as if you were buying an entire gun.
SKS receivers are milled. AK receivers can be stamped or milled.
Try the receiver
A brand new SKS stripped receiver, depending upon manufacturer, will sell in the range $US 45 to $65. A receiver, with all fire control parts except stock and barrel, should sell for approx. $120 - $130.
The best place to buy SKS mags would be Tapco. Drums maybe.
Check the receiver.
The RUSSIAN SKS may be date marked on top of the receiver cover (properly called the rear housing) , along with the symbol of the arsenal that made it.
You do not say who made your SKS.That helps and usually the russian made SKS rifles will have the year of production stamped on the receiver cover.I am not so sure on the Norinco made ones.
On the receiver. left side, just below the bolt.
Year of Manufacture is stamped behind the serial # on the left side of the receiver.
SKS Microfinance was created in 1998.
To determine the year model of your SKS rifle, check the serial number located on the receiver or the barrel. This number is often accompanied by a factory code that can help identify the manufacturer and production year. You can also refer to specific SKS reference guides or online databases that correlate serial numbers with production dates. Additionally, examining any markings or features on the rifle can provide clues to its model and year.
The D and M models accept AK47 magazines whereas the standard sks has an integral magazine.