In dictionaries:
Exotic R4
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Vektor R4
a South African 5.56×45mm assault rifle.
Remington R4
a firearms platform based on the AR-15/M16/M4/M4A1 series designed and manufactured by Remington Arms.
R4 cartridge
Jaguar R4
a Formula One car with which Jaguar Racing competed in the 2003 Formula One season.
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