DA Form 7451 – M2 Caliber .50 Heavy Barrel Machine Gun Firing Tables Iv (A) And Iv (B), Night Qualification Scorecards (Mounted Or Dismounted, Prone Or Fighiting Position) DA Form 7451 - M2 Caliber .50 Heavy Barrel Machine Gun Firing Tables Iv (A) And Iv (B), Night Qualification Scorecards (Mounted Or Dismounted, Prone Or Fighiting Position)