I had a Yugo SKS that was in a TAPCO stock. While it was heavy it was a good solid unit.
I also picked up a great Norinco in the ATI stock that the OP is inquiring about. My intent was to restore the rifle to original configuration, which I have since done, but had ample time to form an opinion about the ATI. I wasn't at all impressed. The folding stock was extremely loose with a horrible lock-up. The wobble was horrible. Knowing what I know about the ATI Lightweight I wouldn't begin to consider it. The TAPCO stock is heavier but a good solid piece of work.