I've had a yugo SKS for many yrs. It's in good original shape, matching #'s, all the accessories, etc and I would like to keep it that way, but I have been thinking about purchasing another SKS to modernize and build up, but have some questions and looking for some advise. Are any of the SKS models (Yugo, Norinco, etc) better for building up with kits than any other? I will want replace the drop mag with a removable large cap mag. I would like to install optics, bi-pod, collapsable stock... Which models work best for that? Are any models more accurate at longer distances (I know these are not super long range machines..)? Thoughts? advise? Thanks all!