30 mm caliber - Wikipedia
Caliber .30 ammunition
30 mm caliber - Wikipedia
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30 mm caliber - Wikipedia
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File:US 30x113mm Caliber Ammunition -b.jpg - Wikimedia Commons
San Escobar - PS-23R pistol caliber carbine (PCC) by PaulSulewski on DeviantArt
Does the T-14 Armata have a 30mm cannon? I've heard rumours about that. Even the wiki article says there might be. - Quora
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30mm DS30M Mark 2 Automated Small Calibre Gun - Wikipedia