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Old January 21, 2013, 09:01 AM   #12
Senior Member
Join Date: November 20, 2008
Posts: 10,534
There are different barrel configurations without the gas-block/front sight. Some people choose to use a rail system for mounting a sight. An AR doesn't have to come in a configuration with the gas-block/front sight.

The gas-block combined with front sight is just an efficient, light-weight design that I guess the military likes.
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