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Old January 20, 2013, 09:38 PM   #4
Senior Member
Join Date: July 30, 2011
Location: Reno NV
Posts: 828
Original AR's had a longer barrel and hence, a longer sight radius. When they went to the carbine version the same sight/gas block was kept for ease of manufacture.

As for being a short range weapon, They are reasonably accurate out to 500 meters. For all practical purposes, that is a long distance for a combat situation.

I have shot my AR15-A2 with a standard length 20" match barrel quite accurately out to 600 yards.
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