I have always very much enjoyed the wider hood on the H&K sights and finally, Lewis Machine and Tool has stepped up to manufacturer a set of standard-height sights that fill the market void, but will leave your wallet equally void at a MSRP of $249.
Available in either 5.56 or .308 (same price for either), the aptly named BUIS Flip Up Sights are set up for built-it BDC on the rear sight adjuster. No word on materials or finish, but knowing LMT, its vastly over-engineered and over-built (which are concepts I am also a fan of).
Personal bet on Manganese Phosphate exterior over a 4140 steel base. Any takers?