 Several sources have stated that Rick Jason was to carry the M1928A1  Thompson submachine gun. After two days of filming the series, Jason  complained about the weight of the Thompson switched to the lighter  M1 carbine and carried it throughout the rest of the series. Vic  Morrow was then given the Thompson to carry. After two weeks, he too  complained of its weight. A lighter replica Thompson was made out of  wood and was carried by Morrow until it was time for a firefight at  which time he would switch back to the real Thompson. The replica  can be seen with its incorrect ejection port. It should also be  noted that officers usually carried a carbine and rarely a Thompson  or M1 Garand.