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3BK21
The 3BK21 (3БК21) is a highly uncommon, Soviet-era developed, Russian Federation, 125 mm high explosive, anti-tank fin-stabilised tracer (HEAT-FS-T) projectile. Next to no information is available on the 3BK21, though it is thought to use the VU-729 (ВУ-729) fuzing system. It is not known if it has a steel or copper shaped charge liner. The 3BK21 projectile, if seen at all, would be marked-up in its short-form designation of BK21 (БК21), an...
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