Actually, they came with a rear peep sight. Most were grooved to add a scope (don't ask me how, but I have 3 of the 152's, a 142, couple of 51M's, and 4 of the 151K's. Things got out of hand)
The 152 was made 1948-1957. You can get 10 round mags from havlinsales.com. These are great plinkers or hunters. They were replaced by the 352. Price has been inching up on these. Prices on the 142 is ridiculous!