The ZH 200 series are differrent than the ZH 300 series, how much I am not sure, but each series has been improved on and parts ussuallt don't interchange, but they are a good durable gun if the 22hi-power is good enough fo you. I suggest you get a scope mount as the sights are very rudermentary, they need to come up with a peep sight that can mount to the scope mount base! For the price you can't go wrong, you can buy 2 and use one for parts in the future, but I have yet to have anything go wrong with my ZH-307 or my ZH-502 series guns, very robust and durable. The stocks are not the pretiest design to us Nortg americans, very Euro look, good luck Dale Z!