How can I increase the length of the vector sign to be almost equal to the argument?

The esvect package has very nice vector arrows, with 8 different arrow tips:

\documentclass{article}
\usepackage{array}%
\usepackage{esvect}

\begin{document}

\[ \begin{array}{ll}
        \vec{v}&  \vv{v}  \\
    \vec{V} &  \vv{V}\\
    \vec{AC} &   \vv{AB}\\
    \vec{ABCD} &  \vv{ABCD}
    \end{array} \]
\end{document}