Back pain is also common with increased cell phone use, especially if you hold the phone between your neck and shoulders as you multitask. Long periods of cell phone use cause you to arch your neck and hold your body in a strange posture. This can lead to back pain, says Healthcentral.com.
A recoilless rifle (RCLR) or recoilless gun is a type of lightweight tube artillery that is designed to allow some of the propellant gases to escape out the rear of the weapon at the moment of ignition, creating forward thrust that counteracts some of the weapon's recoil.lder recoilless rifles are still used by the U.S. National Park Service and the U.S. Forest Service as a system for avalanche control. The Washington State Department of Transportation uses a 105 mm recoilless rifle for avalanche control on Interstate 90.
A semi-automatic firearm is a gun that, after firing ONE round, automatically loads the next round from the magazine into the chamber, ready to be fired only when the trigger is pressed AGAIN. That is, a semi-automatic gun is one trigger pull = one round fired. You have to pull the trigger again to fire another round. #3 refers to guns that require you to manually load the next round into the chamber through some special action.