Or this will enable the gunman to easily barricade himself in a room with lots of hostages.
When will liberals realize that the only way to deal with an evil person with a gun is with a good person with a gun.
Check it out:

A middle school teacher in Muscatine, Iowa has created a mechanism to thwart would-be school shooters that is so deceptively simple it just might work.

The teacher is Daniel Nietzel, reports local NBC affiliate KWQC.

Like any great American inventor, Nietzel turned his inspiration into reality in his basement using some stuff he had around the house.

“I found the top of a Rubbermaid container and measured out geometrically the shape I needed and cut out five pieces,” Nietzel told KWQC. “Then I got out the hot glue gun and on my work shop table in the basement, hot glued it, and let it dry.”

And voila! “The Sleeve” was born.

It’s an amazingly simple product. As the name implies, it’s a v-shaped sleeve. It fits quickly and snugly over that v-shaped metal arm above a typical door to a school classroom. Once it’s attached correctly, The Sleeve can absorb up to 600 pounds of force — and keep the door closed.

Nietzel’s company, Fighting Chance Solutions, has already made sales in 22 states in the few weeks it has been in existence. Schools have purchased The Sleeve, obviously. So have corporations, hospitals and military units.

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