The NS-522's that the guys in the Commonwealth countries have access to usually had much nicer stocks, and the NS-522 had a heavier barrel.
The stock I bought from Kengs (Poly Technologies in Atlanta) was meant for the heavier barrel NS, so I have a good 1/8" of air around my sporter weight barrel, free floating for sure.
You can see some nice grain if you look closely, I think a refinish with darker stain and some Tru-oil would bring out that grain, the light stain and sprayed on poly finish it currently has doesn't do it justice.
The NS-522 has the spirals from the rotary hammer forging process, they turned those barrels down to put on the EM=322 so mine doesn't have the spirals.
The first time I looked down the bore I was impressed, the rifling looks as sharp and precise as any I've ever seen.
The triggers on these seem a bit crude but work. Mine was around 4 lbs. and had excessive pre travel.
I put a pop can shim in with JB Weld to reduce the creep and changed out the spring for the safety pin, now the trigger is short and sweet at 1.5 lbs.
The weird grey finish that Norinco used on the floor plate, mag base plates and the magazine holder for the stock bugged me, I finally got around to putting some Midnight Black Cerakote on them.
Original stock with the mag holder: