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T20 long mortar
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An unidentified grenade launcher from the Sino-Japanese War [
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Last picture of an “unidentified grenade launcher” looks very similar to the in-game Russian RMN-50 (tier 3, 50mm shoulder fired mortar)
Naiman Hand Mortar:
7 Rare Mosin-Nagant Rifle Modifications and Accessories | thefirearmblog.com).
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