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53-UOR-281U
The 53-UOR-281U (УОР-281У) is a 57 mm high explosive incendiary tracer (HEI-T) cannon round. The 53-UOR-281U round comprises: a 53-OR-281U (53-ОР-281У) high explosive incendiary tracer (HEI-T) projectile; an MG-57 (МГ-57) or MGZ-57 (МГЗ-57) fuze; and the 54-Zh-281 (54-Ж-281) charge system. The 53-UOR-281U round is normally found marked up with its short form designation of UOR-281U (УОР-281У), and not its full GAU (later GRAU) index code...
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