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Two Ukrainian-made Snipex Alligator anti-materiel rifles chambered for 14.5×114mm
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They are suppressors (a.k.a. silencers). They work just like your car's muffler and both were invented by the same guy: the grandson of the inventor of the Maxim machine gun.
It will certainly not make these monster guns movie-quiet but it reduces their massive sound and flash signature making it harder to locate where they were shot from.
Well that's a cool TIL.