"I would like to see armed protection at each school," 34-year-old McGregor wrote on social media.

Of course, six people -- three children (9-year-olds) and three adults -- were shot and killed on Monday at The Covenant School when a 28-year-old entered the building and went on a murderous rampage before police heroically stopped the shooter, who died at the scene.

McGregor, a dad of three who spends a lot of time in the States and is currently in Orlando, says "I have had my children at school here while stateside and have had my own armed guard present at the school. This was prior to the most recent school shooting also."

Conor continued ... "If she shot her way in to that school from the outside, my guard, who is tucked away, armed and unseen, would have seen her and taken her down. Saving those children’s lives."

Many schools have Resource Officers -- typically retired cops -- stationed at schools, but not always. There have also been fatal shootings at schools where armed security was present.

The Covenant shooting is simply the latest in a long line of horrific attacks ... and has sparked debate among Americans -- how do we protect our kids?

There are a lot of different proposed solutions ... from banning guns to arming teachers. Conor believes the answer is armed guards.