The 20 gauge SX3 has all the features of the 12 gauge Walnut Field, including a machined rib with solid brass bead at the muzzle, the self adjusting Active Valve gas system for reduced felt recoil and a trim grip and forearm. A traditionally styled, Pachmayr Decelerator pad absorbs recoil and length of pull is adjustable with two spacers provided. The back bored, Invector Plus, choke system ensures tight, consistent patterns. Full, Modified and Improved Cylinder choke tubes are included. The gunmetal gray Perma-Cote UT protects against the elements.