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M55A1 (TP-T - M4/M10)
The M55A1 is a fixed, 37 mm, target practice tracer (TP-T) round, which was used by 37 mm M4 (T9, AN-M4) and M10 (AN-M10) aircraft cannon. The M51A1 TP-T emulates the M54 high explosive tracer self-destruct (HE-T-SD) cannon round. Other than a drill round, the only other known round in the family is the M80 armour piercing tracer (AP-T) cannon round. The projectile used in the M55A1, along with those used in the M54 and M80 rounds, are t...
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