Suppressor/hop up

Hi, I am looking for a hop up for my gen9 m4a1 and heard that there are metal hop ups that also act as suppressors. I was wondering if this is true and also any recommended hop ups would be great.

Thanks

Gel blasters are quiet apart from the gearbox cycling… a ‘suppressor’ is only to look good really… it makes the muzzle end look more awesome… there is no quietening effect… like

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