Plural of fortyfive; multiple firearms chambered in .45 caliber, or multiple things numbered 45.
Simple plural of 'fortyfive' formed by adding '-s'. Follows standard English pluralization rules for compound numerals and firearm slang terms.
In hip-hop and crime narratives, references to '45s' (plural) became iconic markers of street credibility and danger—from old Colt 1911 pistols to modern .45-caliber weapons, showing how a caliber designation evolved into powerful cultural slang.
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