Wilson Combat Match-Grade Barrel Bushings are produced from top- quality steel for maximum reliability and wear. Our Stainless Steel bushings #29S & #29SC are designed for .580 O.D. barrels and require only minor fitting. The #29B Blued bushing is a pistolsmith part with considerably more material on the O.D. and I.D. for use with smaller barrels or when special situations require additional material.