Burris Supreme Universal SU One Piece Bases are members of the huge selection of Burris Accessories. Precision machined from bars of solid steel, each exquisitely styled Burris SU Supreme Universal 1 Piece Mount Base is carefully hand polished, blued and meticulously inspected. Burris Supreme Universal Bases ( SU ) are recognized as the best one-piece base available. Made by hand every step of the way, the Burris bases're strong enough to take the recoil of any caliber.