A Florida mother who runs a “gun sense” Facebook page is recovering after she was shot in the back by her four-year-old son while she was driving.

Police saw Jamie Gilt in distress in her pick-up truck on Tuesday afternoon in Putnam County.

The 31-year-old said she had been accidentally shot by her son, who was sitting in the back seat.

Deputies say a .45-calibre handgun was on the floor of the vehicle, which had been hauling a horse trailer.

Jamie Gilt For Gun Sense

Ms Gilt’s Facebook page, “Jamie Gilt for Gun Sense”

The boy wasn’t harmed and he was reunited with family members.

The Department of Children and Families will investigate, said police.

Ms Gilt was taken to a Gainesville hospital, where she was in a stable condition.

She runs a Facebook page called Jamie Gilt for Gun Sense.

It features such posts as “My right to protect my child with my gun trumps your fear of my gun.”

During a debate about guns on her Facebook page on Monday, Ms Gilt wrote: “Even my 4 year old gets jacked up to target shoot with the .22.”

Scores of vitriolic and mocking comments have been left on the page since her injury made headlines.

One person wrote: “Jamie will not be standing up for gun rights for a while.”