Nope definitely aluminum, and definitely the standard width. I will post a few links later! For example, cabelas has them advertised at the lighter weight than what is advertised at basspro or the ameristep site.lonearcher said:I know they had a double wide aluminum version that is now discontinued, that may be what you are seeing. Other than that it may be the steel ones.
11.5 lbs @ Cabelas.BillMotlet said:Ameristep advertises at 14.5 lbs and Bass Pro is the same for the aluminum non-typical rapid rails.
Not sure where you are getting 11.5 lbs.
Great product though!