very interesting post. i'am a fan of co2 ( odd i know) and use a tau 7 and aeron b96 regularly. i'd like a co2 target rifle but the only two i'am aware of are the alpha proji which i've never seen for sale anywhere and the tau 200 which i've only seen advertised once and that was two years ago. i have pondered the idea of building a rifle using a tau or cameleaon as the base and adding a stock and barrel as you describe. trouble is that a decent pistol is going to make this a very expensive project. i didn't realise that feg did a rifle version. are there any other co2 target rifles out there that i should know about and has anyone come across a tau 200 or the alpha?