When you ask about some CAD drawings your nickname should not sound like chinese, vietnamese and other ese one, Mr Hongkhoa. You must be intelligent to put your hands on these drawings.
Yes, I understand copyright sensitive issues, I know they liken me to China, I want the drawings to be redesigned, not completely copied! Above all I know I was wrong but try my best because of my passion for airguns in a backward country like Vietnam! excuse me
You not are in China, because only to try to do a gun in this country it is a illegal act and you can should go to the jail. Also the Chinese citizens have a limited access to this kind of web site. My recomendation is the following.
Study the Physics laws about pressure, friction, expansions gases, materials, etc. Buy a cheap CAD and start you own design. Is probably that you failure in the first prototypes, but you will learn a lot. And finally you will create you own and original airgun.
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