I had one when I was 8 , an bought another about 2 years ago for my partner's son. Their alright for abit of fun, but anything serious, I'd go for the Cometa 220(if they stil do it, I had one also) upwards, like the 300-400-400 fenix etc.
The 50 will probably be putting out about 6-7ft lb same as most juniour guns. But good luck in your findings ,Atb.