This is a detailed replica "softair" made by Daisy. These were produced only in 1986-1987.
The softair replica is marked: ".25 CAL 6MM Plastic Shot"
Comes with 1 magazine (30 round) and a shoulder sling.
Daisy offered a product line of 4 replica sub machine guns and a shotgun:
Softair Model 12: the KG-9 (TEC-9 with silencer)
All the replicas were single shot, and shot a low-power white plastic 6mm (1/4 inch) plastic ball "BB". The machine guns all have real 20-30 shot magazines, and plastic brass-colored bullets which accept a "BB" pushed into the tip. A spring-powered "firing pin" pushes the "BB" out of the barrel. All of the Softair guns have become difficult to locate.
I have the owner manual and order form for the 6MM plastic shot, cartridges, and shells.
I am asking $100.00 shipped, lower 48.