This video demonstrates the most explosive way to breach a door. We get an up close and personal look at the Grenade Rifle Entry Munition, also known as GREM, launching the Simon breach grenade at an unsuspecting door.
The GREM is launched using a 5.56 mm cartridge. A 40 cm rod on the front strikes the door first and drives the explosive material into the door with enough force to detonate. The GREM is effective anywhere from 15-30 meters and is designed to make door breaches safer and more effective for soldiers.