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Listed below are a number of different websites that explain the difference between telescopes and optical sights that shooters use on rifles. In a nutshell, telescopes that are mounted on rifles are used to enhance long range accuracy. Optical sights that are mounted on rifles are used to enhance general shooting accuracy at close range and increase shooting speeds. A good survivalist should probably be aware of the difference between both types of sighting aids and probably have both types available to use on his or her survival rifle. Probably the easiest way to enhance your general shooting accuracy with a survival rifle would be to mount a simple and compact 4X or 4 power scope on your rifle. Make sure that such a scope has illuminated reticles for use at night time or in low light conditions. Zero the scope at 50 yards and you should be good to handle most shooting situations from zero to 300 or 350 yards.
http://en.wikipedia.org/wiki/Rifle_scope
http://en.wikipedia.org/wiki/Sniper_rifle
http://www.notpurfect.com/main/sights.htm
http://www.defense-update.com/features/du-3-05/feature-sights.htm
http://www.chuckhawks.com/optical_sights.htm
http://www.gunblast.com/Trijicon_ACOG.htm
http://en.wikipedia.org/wiki/Rifle_scope
http://en.wikipedia.org/wiki/Sniper_rifle
http://www.notpurfect.com/main/sights.htm
http://www.defense-update.com/features/du-3-05/feature-sights.htm
http://www.chuckhawks.com/optical_sights.htm
http://www.gunblast.com/Trijicon_ACOG.htm