i don't see a thing wrong with it.
the thing with the AR , building one is like that old "more than one way to skin a cat" saying.
there are like a million variations you can build for various purposes.
the prices on AR-15 hardware are kinda soft these days due to the recession and a glut of parts that was churned out in anticipation of some kind of ban back in 08-
i figure once this glut of spares is bought up prices will go back up. so today is a good time to build.
there are plenty of good quality parts floating around today and not as much of the "junk" stuff.
ironically the ban on imported parts has helped eliminate most of the junk AR stuff--LOL!