this nmap and imap work, but the vmap does not

These mappings work to put '\ ' at the start of the current line.
nmap <silent> <F5> :s/^/\\ /e<cr>
imap <F5> <c-o><F5>

visually select 4 lines
This vmap works, puts '\ ' at start of each line.
vmap <F5> :s/^/\\ /e<cr>gv

visually select 4 lines
This vmap does NOT work. How to make it work?
vmap <F5> <F5>gv

" ==============================================================
These mappings all work.
let sr5='s/^/\\ /e'
nmap <silent> <F5> :<c-r>=sr5<cr><cr>
imap <silent> <F5> <c-o>:<c-r>=sr5<cr><cr>
vmap <silent> <F5> :<c-r>=sr5<cr><cr>gv

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