Abstract: At approximately 7:30 a.m. on October 17, 2003, Employee #1, a carpenter with B & B Framing, Inc., was working at a residential construction project in Menifree, CA. He was using a Hitachi pneumatic nail gun, model no. N-16, to join ceiling joists over a beam-bearing wall. Employee #1 was holding two 2 in. long by 10 in. wide joists with his left hand when he fired the nail gun. It kicked back, striking his left arm, and firing a 16d, 3 1/4 in. long nail into his left forearm. He suffered a puncture wound and was transported to Menifee Valley Medical Center in Sun City, CA, where he was hospitalized for four days. Employee #1's finger was on the nail gun's trigger when it struck his arm, causing it to fire.