RifleConnection.com offers high quality Firearm 3D CAD Models and Blueprints of firearms and firearm components.  There are many sources online where you can find supposed firearm component models, but we are the ONLY trusted source who will stand behind our dimensions given. These tools are great for gunsmithing, home building, or even prototyping production products! Our firearm blueprints include important information such as material types, tolerances, and even post processing treatments that are recommended. Just because technology advances, shouldn't mean that your methods of manufacturing firearms should stay the same. Protect the Second. 

Consult your local laws and regulations before attempting to build any firearm.