Not in the US, up to a certain point. Certain kinds of weapons and weapon shapes are regulated.
As a rule of thumb, historically US law has reflected the following, "If it's not explicitly banned, it's OK. And if you do it while banned and it is kind of awesome, the law will change". This has changed considerably in many areas, but still generally holds true as an ideal.
edit: let's not downvote someone for asking a reasonable question. lots of places exist with lots of regulations.
As a rule of thumb, historically US law has reflected the following, "If it's not explicitly banned, it's OK. And if you do it while banned and it is kind of awesome, the law will change". This has changed considerably in many areas, but still generally holds true as an ideal.
edit: let's not downvote someone for asking a reasonable question. lots of places exist with lots of regulations.