Put the stock box mag back in for now. Overall this build was a bit of a pain in the ass, but now it's finished and I'm very happy with it. Overall length is 29" on the nose with an 18" barrel. Balances very nicely.
I had a hell of a time installing the trigger linkage. At first I had it adjusted to take out all the sks pre travel. It felt great, but the trigger would not reset. After much playing around, I finally have it all working right. There is a very precise spot this linkage needs to be to work. I could have taken pre travel out by some more work on the sear, but I just don't feel like it now lol. With the trigger work I've done it feels like a decent 2 stage. Very light first stage, and now I have a very smooth second stage I'm estimating at between 4.5-5.5lbs. Even with the linkage assembly, it blows the long, shitty, gritty, heavy stock sks trigger away.
Overall highly recommend if you have the patience to wait on the stock delivery, and the patience to custom fit and tinker with assembly.