Is that a regular AK mag laying along side? Does it function in the gun? If so, it is likely a Chinese SKS-D or M. They were the only ones made for AK mags. Highly desirable. Non-standard, US made stock detracts from collector value, but probably worth $500+ depending on the locale.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball