boneheaddoctor -
The AK was primarily designed by M.T. Kalashnikov and Hugo Schmeisser. The SKS was designed by S.G. Simonov. Some SKS carbines are both very well made and accurate. Additionally, some SKSs were designed for use with detachable magazines. There was also a sniper version that used the same (PU) scope that is normally seen on the Mosin Nagant M91/30 sniper rifle. Some of the SKSs from China that were made for export to the US in the late 80s or early 90s are pretty sad. Those made in the 60s can be very nice.