Odin Works, Enhanced Lower Parts Kit, Black, Fits AR15 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 31 piece set to complete a lower Major Parts are Nitride Coated Winter trigger guard This Enhanced complete lower parts kit comes with all major parts Nitride Coated. Nitride Coating increases part finish hardness, toughness, and adhesion. Comes with winter trigger guard. Made in the U.S.A!