Rangers Photo - M4 with M203 Grenade Launcher

U.S. Army Ranger armed with a M4A1 carbine, fitted with an underslung M203 40mm grenade launcher.

Note the shortened shotgun strapped to the Ranger's thigh.

Shotguns are often loaded with breaching rounds that are used to shoot the locks and hinges off doors.

When loaded with buckshot and slugs they are ideal for room clearing.