Complete lowers, assembled or not, pistol or rifle...
http://karrisguns.com/kg-ar15-complete-6-position-lower-receiver.aspx
http://karrisguns.com/kg-ar15-carbine-lower-kit-unassembled.aspx
http://karrisguns.com/kg-ar15-complete-pistol-lower.aspx
http://karrisguns.com/kg-ar15-pistol-lower-kit-unassembled.aspx
http://karrisguns.com/kg-ar15-complete-6-position-lower-receiver.aspx
http://karrisguns.com/kg-ar15-carbine-lower-kit-unassembled.aspx
http://karrisguns.com/kg-ar15-complete-pistol-lower.aspx
http://karrisguns.com/kg-ar15-pistol-lower-kit-unassembled.aspx