There are no less than FIVE types available to the prospective shooter,ALL are in used condition,so here's what to look for,first how to spot a "DO NOT WANT!!" It will be a Chinese SKS made for civilian consumption. It will have STAMPED parts. The barrel will be pinned in and "skinny". The stock will resemble pine,and it probably is! It will rattle like a BB in a box car. The finish on the exterior will be commercial and smooth. The receiver is thinner than a good SKS. AVOID THESE HUNKS OF CRAP AT ALL COST! Here's how to spot a good one: All milled parts. Threaded in barrel. Actual hardwood stock. The barrel is a good .125 thousandths heavier. there are tool marks evident on the barrel and receiver.this means its a military grade weapon.over all it will appear rough,lacking a commercial polish etc.YOU WANT TO SEE THIS ON AN SKS! The Barrel will likely have a chrome bore,but not always a chromed chamber,IF the chamber is not chromed,YOU MUST inspect for wear carefully!a friend of mine bought a Yugo that was NIB and it would split brass.it had been chambered too deep.that's not common,but worth looking into,there was a Ruger red-hawk that left the factory with no rifling once. Matching serial numbers,do you really want a pile of spare parts? Tweeking the SKS. Not hard to do on a winter evening,you need: .005 brass shim stock. Engine block epoxy. painters tape. a Popsicle stick. Lithium grease. A small drill or rotary tool and a 1/8" drill bit. First the easy stuff: Shimming the trigger group. Cut a piece of the .005 brass shim stock twice as wide as the trigger group,fold it double and hammer it flat,trim it to size,place it under the trigger group in front of the trigger,whap it with a rubber mallet to seat it,and you're done.this removes rattle in the group and increases accuracy. Shimming the hand guard,this also works on an AK. Remove the hand guard. Drill some 1/8X1/8" holes where wood meets wood in the stock,use a lead pencil to outline your work area. Split the Popsicle stick down the middle and using gorilla glue or a similar high quality adhesive,glue them in place down the sides,when dry,sand the edges flush and stain to match the stock,this also enhances accuracy. Now the hard part,bedding the action. First,dis assemble the weapon.then coat the action and barrel with the grease where it will mate to the wood,set it aside for now. IMPORTANT STEP! Cover the cleaning rod channel with the painters tape,use a 3/4" strip and make damn sure its covered! taking your drill or rotary tool,drill a bunch of holes at random similar to the ones you drilled for the hand guard,try not to put holes in the tape. mix up 1/2 a tube each of the epoxy and smear it into the barrel channel and place the greased action back into the stock and let dry,be observant and neat lest your weapon never come apart again!immediately remove any overflow.re assemble your SKS and allow the epoxy to harden. Now your SKS is more accurate and that's always a good thing!