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228 Posts
Its more then likely coming out from around the charging handle. PRI makes a Gas Buster charging handle.
http://www.cardinalarmory.com/cardarm-pcart/pc/viewPrd.asp?idcategory=4&idproduct=24
http://www.cardinalarmory.com/cardarm-pcart/pc/viewPrd.asp?idcategory=4&idproduct=24