The design for a shotgun silencer is different than one for a solid projectile (rifle, pistol silencers)
Basically it involves porting the barrel and putting an outer tube and baffles over that, so that you can use buckshot/birdshot/slugs without a problem.
But no, a tiny silencer like that wouldn't have reduced sound as shown in the movie. They need to be, in a word, HUGE.
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