How do weapon nerfs and buffs work?

What happens to existing versions of the weapons that were Nerf or buffed?
Do they adjust those weapons or do you have to look for new versions of them with the adjustments?

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Just adjusts currently owned and any picked up from that point on.

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Ah ok. Thanks.

Actually the guns I already owned didn’t change at all.
So it means we have to look for new versions? That sucks.