I've been think for awhile about getting an 80% lower (or 6) this article about has me convinced to do it.
http://www.realcleardefense.com/articles/2015/02/28/i_built_an_ar-15_in_my_kitchen_107676.html
http://www.realcleardefense.com/articles/2015/02/28/i_built_an_ar-15_in_my_kitchen_107676.html