Great shape. $80 shipped.
Info:
https://www.midwestindustriesinc.com...-p/mi-aksm.htm
https://farm8.staticflickr.com/7927/...a3f56bbd_c.jpg
https://farm8.staticflickr.com/7901/...ab717726_c.jpg
Also KVAR KV04S like this:
https://www.k-var.com/kv-04s-optimiz...or-ak-variants
This one is $70 shipped. This will fit an AKSU with the rail as pictured.
https://farm8.staticflickr.com/7855/...71c3f6cb_c.jpg