documentclass{article}

newcommand{strutarrow}[2]{%
  vrule width 0pt height 2fontdimen22
  ifx#1displaystyletextfontelse
    ifx#1textstyletextfontelse
      ifx#1scriptstylescriptfontelse
  scriptscriptfontfififi 2
  {#2}%
}
newcommand{srightarrow}{%
  mathrel{mathpalettestrutarrowlongrightarrow}%
}

begin{document}

fbox{$srightarrow$}

end{document}