Products of involutons in symplectic groups II

We show that the symplectic groups Sp(2n, K) over a field $K$ are 5-reflectional if $2n\ge 4$. If $n$ is even and $(2n,K)\mathrm{\ne }(4,\mathrm{G}\mathrm{F}(3))$ they are even 4-reflectional.